isothermal vs equal

isothermal is not a noun while equal is a noun.

Word	Noun	Adjective	Verb	Adverb
isothermal	No	Yes	No	No
equal	Yes	Yes	Yes	No

isothermal (noun)	equal (noun)
	a person who is of equal standing with another in a group

isothermal (adjective)	equal (adjective)
of a process or change taking place at constant temperature	having the same quantity, value, or measure as another
	having the requisite qualities or resources to meet a task

isothermal (verb)	equal (verb)
	make equal, uniform, corresponding, or matching
	be identical or equivalent to
	be equal to in quality or ability