missionary position vs sex activity

missionary position and sex activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
missionary position	Yes	No	No	No
sex activity	Yes	No	No	No

missionary position (noun)	sex activity (noun)
a position for sexual intercourse; a man and woman lie facing each other with the man on top; so-called because missionaries thought it the proper position for primitive peoples	activities associated with sexual intercourse