constant vs continuous

constant is a noun but continuous is not a noun.

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

constant (noun)	continuous (noun)
a quantity that does not vary
a number representing a quantity assumed to have a fixed value in a specified mathematical context

constant (adjective)	continuous (adjective)
steadfast in purpose or devotion or affection	continuing in time or space without interruption
uninterrupted in time and indefinitely long continuing	of a function or curve; extending without break or irregularity
unvarying in nature