tropical year vs solar year

tropical year and solar year both are nouns.

Word	Noun	Adjective	Verb	Adverb
tropical year	Yes	No	No	No
solar year	Yes	No	No	No

As nouns, tropical year and solar year are synonyms defined as:

tropical year and solar year: the time for the earth to make one revolution around the sun, measured between two vernal equinoxes

Other synonyms of tropical year include astronomical year, equinoctial year.

tropical year (noun)	solar year (noun)
the time for the earth to make one revolution around the sun, measured between two vernal equinoxes	the time for the earth to make one revolution around the sun, measured between two vernal equinoxes