variation vs tide

variation and tide both are nouns.

Word	Noun	Adjective	Verb	Adverb
variation	Yes	No	No	No
tide	Yes	No	Yes	No

As nouns, tide is a hyponym of variation; that is, tide is a word with a more specific, narrower meaning than variation:

variation (noun)	tide (noun)
an activity that varies from a norm or standard	the periodic rise and fall of the sea level under the gravitational pull of the moon
the act of changing or altering something slightly but noticeably from the norm or standard	something that may increase or decrease (like the tides of the sea)
(ballet) a solo dance or dance figure	there are usually two high and two low tides each day
an artifact that deviates from a norm or standard
something a little different from others of the same type
a repetition of a musical theme in which it is modified or embellished
an instance of change; the rate or magnitude of change
(biology) an organism that has characteristics resulting from chromosomal alteration
(astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon)
the process of varying or being varied
the angle (at a particular location) between magnetic north and true north