When Is H Silent in English? The Complete Pronunciation Rule

The letter H is one of the trickiest consonants in English. Most of the time, you pronounce it as a gentle puff of air at the start of words like house, happy, and help. But in certain words, the H is completely silent, and the word begins with a vowel sound instead. Knowing when H is silent matters for two reasons: correct pronunciation and choosing the right article (a vs. an).

This guide covers every pattern you need to know, from always-silent H words to the tricky cases where H disappears inside longer words.

The Core Rule: Listen to the Sound, Not the Letter

Here is the fundamental principle:

• If a word starts with H but the first sound is a vowel, the H is silent.
• If a word starts with H and the first sound is /h/, the H is pronounced.

This means you must listen to how a word sounds, not how it is spelled. The letter H is just a letter. What matters is the sound that comes out of your mouth.

Examples

• hour /aʊər/ begins with the vowel sound /aʊ/, so H is silent.
• house /haʊs/ begins with the consonant sound /h/, so H is pronounced.
• honest /ˈɑːnɪst/ begins with the vowel sound /ɑː/, so H is silent.
• hospital /ˈhɑːspɪtəl/ begins with the consonant sound /h/, so H is pronounced.

Always-Silent H Words (Memorize These)

A small group of common English words always have a silent H at the beginning. These words came from French, which dropped the H sound centuries ago. English kept the spelling but lost the pronunciation.

And their related forms:

• hourly /ˈaʊərli/, honestly /ˈɑːnɪstli/, honorable /ˈɑːnərəbəl/, heirloom /ˈɛrluːm/

The Special Case: Herb

In American English, herb is pronounced /ɜːrb/ with a silent H (so you say "an herb"). In British English, the H is pronounced: /hɜːrb/ (so you say "a herb"). This guide focuses on American English pronunciation.

The "A" vs. "An" Connection

The rule for choosing between a and an depends on the sound that follows, not the letter:

• Use "an" before a vowel sound
• Use "a" before a consonant sound

Since silent-H words start with a vowel sound, they take "an":

Common mistake: Some learners say "an hotel" or "an historical event." In modern American English, H is pronounced in hotel and historical, so the correct forms are "a hotel" and "a historical event." The old-fashioned British usage with "an" before these words is fading.

Silent H Inside Words (After EX-)

When H appears after the prefix ex-, it is almost always silent. The EX- absorbs the H, and you pronounce only the surrounding sounds.

Notice the pattern: in exhaust, exhilarate, and exhibit, the EX- is pronounced /ɪɡz/, and the H vanishes completely. You never hear /ɪɡzh/ in these words.

H Often Silent in Fast Speech

Some words have an H that is technically there in slow, careful pronunciation but disappears in normal conversational speed.

In vehicle and vehement, most American speakers do not pronounce the H in everyday speech. Technically, a careful pronunciation could include it, but it sounds natural without it.

Historical and Borrowed Words: Why Is H Silent?

The silent H in English is not random. It follows historical patterns:

French Borrowings

When English borrowed words from French after the Norman Conquest (1066), many French words had already lost their H sound. English kept the French spelling with H but adopted the French pronunciation without it:

• honor (from Old French onor/honour)
• honest (from Old French oneste)
• hour (from Old French ore/hore)
• heir (from Old French eir)

Ghost Letters

Some English words had an H added by scholars who wanted to show a word's Latin or Greek origins, even though the H was never pronounced in English:

• ghost originally spelled gost in Middle English (the H was added to match the Flemish gheest)
• Thames /tɛmz/ has a silent H from a Latin spelling convention

These "ghost H" letters are historical artifacts. They exist in spelling only.

Words Where H Is Always Pronounced

The vast majority of English words that start with H have a pronounced /h/ sound. Here are common examples to contrast with the silent-H words:

Remember: if you can hear the /h/ puff of air at the start, the H is pronounced, and you use "a" (not "an").

Quick Reference: Silent H vs. Pronounced H

Practice Exercises

Exercise 1: Choose "A" or "An"

Fill in the blank with the correct article:

1. ___ hour of practice every day makes a difference. (an)
2. She is ___ honest student. (an)
3. We need ___ hotel for tonight. (a)
4. He is ___ heir to the family business. (an)
5. That is ___ happy dog. (a)
6. It was ___ honor to meet the president. (an)
7. I need ___ helper for this project. (a)
8. Add ___ herb to the soup. (an, in US English)

Exercise 2: Say It Out Loud

Read these pairs and notice the difference between silent H and pronounced H:

• an hour vs. a house
• an honest person vs. a hopeful person
• an heir vs. a hero
• an honor vs. a hobby

Exercise 3: Spot the Silent H

Which words in this sentence have a silent H?

"The honest heir spent an hour at the exhibition before heading to the hospital."

Answer: honest (silent H), heir (silent H), hour (silent H), exhibition (silent H inside the word). The words heading and hospital have a pronounced H.

Key Takeaways

• Only a small group of common words have a silent H at the start: hour, honest, honor, heir, herb (US).
• H is silent after EX- in words like exhibition, exhaust, exhilarate.
• H often disappears in fast speech in words like vehicle and vehement.
• Use "an" before silent-H words (an hour, an honest mistake) and "a" before pronounced-H words (a house, a hotel).
• The rule is about sound, not spelling. Listen for the first sound of the word.
• Most English words beginning with H have a pronounced /h/. The silent ones are the exceptions, not the rule.

Master these patterns, and you will never hesitate between "a" and "an" before H words again. For more on the H sound itself, see our H sound pronunciation guide.