sex vs flood tide

sex and flood tide both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex	Yes	No	Yes	No
flood tide	Yes	No	No	No

sex (noun)	flood tide (noun)
activities associated with sexual intercourse	the occurrence of incoming water (between a low tide and the following high tide)
the properties that distinguish organisms on the basis of their reproductive roles	the highest point of anything conceived of as growing or developing or unfolding
all of the feelings resulting from the urge to gratify sexual impulses
either of the two categories (male or female) into which most organisms are divided

sex (verb)	flood tide (verb)
tell the sex (of young chickens)
to evoke sexual feelings