shtup vs sex act

shtup and sex act both are nouns.

Word	Noun	Adjective	Verb	Adverb
shtup	Yes	No	No	No
sex act	Yes	No	No	No

As nouns, sex act is a hypernym of shtup; that is, sex act is a word with a broader meaning than shtup:

shtup: slang for sexual intercourse
sex act: sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur

shtup (noun)	sex act (noun)
slang for sexual intercourse	sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur