meridian vs sex activity

meridian and sex activity both are nouns.

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

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

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