invariant vs constant

invariant and constant both are nouns.

Word	Noun	Adjective	Verb	Adverb
invariant	Yes	Yes	No	No
constant	Yes	Yes	No	No

As adjectives, invariant and constant are synonyms defined as:

Other synonyms of invariant include changeless, unvarying.

invariant (noun)	constant (noun)
a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it	a quantity that does not vary
	a number representing a quantity assumed to have a fixed value in a specified mathematical context

invariant (adjective)	constant (adjective)
unvarying in nature	steadfast in purpose or devotion or affection
unaffected by a designated operation or transformation	uninterrupted in time and indefinitely long continuing
	unvarying in nature