Some French words, like contact, have a clearly pronounced -ct, while others, like aspect, have a silent -ct. This difference is due to phonetic evolution, word stress, and borrowing history.

1. The Role of Stress and Borrowing History

• Some -ct words were borrowed later from Latin or retained more of their Latin pronunciation due to their use in formal or scholarly contexts. These tend to keep the pronounced -ct.
• Other words evolved naturally in French from Latin, leading to the loss or softening of the final consonants over time, including -ct becoming silent.

2. When is -CT Pronounced in French?

The -ct is pronounced when:

1. The word was borrowed later and retained a more Latin-like pronunciation.
   • contact → /kɔ̃.takt/
   • impact → /ɛ̃.pakt/
   • direct → /di.ʁɛkt/ (though some speakers may soften it)
2. The -ct is followed by a vowel in a derived form.
   • contact → contacté (the ct is still there in pronunciation).

3. When is -CT Silent?

The -ct is silent in cases where:

1. The word evolved more naturally in Old French, leading to phonetic simplification.
   • aspect → /as.pɛ/ (silent ct)
   • respect → /ʁɛs.pɛ/ (silent ct)
2. The word appears at the end of a phrase or is spoken naturally in fast speech, causing the final -ct to disappear over time.
3. It follows typical French phonetic rules where final consonants are often dropped unless followed by a vowel (liaison).

4. Why Is “Aspect” Silent but “Contact” Pronounced?

• Contact was borrowed later and kept its learned Latin pronunciation.
• Aspect and respect underwent natural French phonetic evolution, leading to the dropping of the final -ct sound.

5. Exceptions & Variability

Some words are pronounced differently depending on region, formality, or personal speech habits. For example, some speakers pronounce direct with a final ct, while others soften it.

Summary

• Pronounced -ct: Later borrowings, more Latin influence (contact, impact, direct).
• Silent -ct: Older natural evolutions, softer phonetic shifts (aspect, respect).