show vs show off

show is a noun but show off is not a noun.

Word	Noun	Adjective	Verb	Adverb
show	Yes	No	Yes	No
show off	No	No	Yes	No

show (noun)	show off (noun)
an act or social event involving a public performance or entertainment
pretending that something is the case in order to make a good impression
something intended to communicate a particular impression

show (verb)	show off (verb)
establish the validity of something, as by an example, explanation or experiment	display proudly; act ostentatiously or pretentiously
provide evidence for
indicate a place, direction, person, or thing; either spatially or figuratively
give expression to
give evidence of, as of records
indicate a certain reading; of gauges and instruments
finish third or better in a horse or dog race
show in, or as in, a picture
take (someone) to their seats, as in theaters or auditoriums
make visible or noticeable
be or become visible or noticeable
give an exhibition of to an interested audience