Chimney
There is no word that can consist of 7 consonants and only have 3 letters. Consonants are letters.
Giraffe has seven letters
Smoke Everyday Get Hype Get Hype
Harriet Tubbman
chimney
Chimney ,
shouldn't your question be," A passage for smoke in a chimney"? just saying
chamber, chimney
Chimney
here
?
白煙
Science is a subject with 7 letters.
7 letters in the word "letters".
Anchovy is an animal. It has 7 letters.
That is an airplane equipped with a smoke generator. The pilot maneuvers the plane to form letters and symbols with the smoke trail.