seven vs sevener

seven and sevener both are nouns.

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

As nouns, seven and sevener are synonyms defined as:

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

seven (noun)	sevener (noun)
one of four playing cards in a deck with seven pips on the face	the cardinal number that is the sum of six and one
the cardinal number that is the sum of six and one

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