briquet vs briquette

briquet and briquette both are nouns.

Word	Noun	Adjective	Verb	Adverb
briquet	Yes	No	No	No
briquette	Yes	No	No	No

As nouns, briquet and briquette are synonyms defined as:

briquet and briquette: a block made from charcoal or coal dust and burned as fuel

briquet (noun)	briquette (noun)
a block made from charcoal or coal dust and burned as fuel	a block made from charcoal or coal dust and burned as fuel