seven vs septet

seven and septet both are nouns.

Word	Noun	Adjective	Verb	Adverb
seven	Yes	Yes	No	No
septet	Yes	No	No	No

As nouns, seven and septet are synonyms defined as:

Other synonyms of seven include 7, heptad, septenary, sevener, VII.

seven (noun)	septet (noun)
one of four playing cards in a deck with seven pips on the face	a musical composition written for seven performers
the cardinal number that is the sum of six and one	seven people considered as a unit
	a set of seven similar things considered as a unit
	seven performers or singers who perform together
	the cardinal number that is the sum of six and one

seven (adjective)	septet (adjective)
being one more than six