sex activity vs meridian

sex activity and meridian both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex activity	Yes	No	No	No
meridian	Yes	Yes	No	No

sex activity (noun)	meridian (noun)
activities associated with sexual intercourse	an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator
	the highest level or degree attainable; the highest stage of development

sex activity (adjective)	meridian (adjective)
	of or happening at noon
	being at the best stage of development