long-time vs longtime

long-time and longtime both are adjectives.

Word	Noun	Adjective	Verb	Adverb
long-time	No	Yes	No	No
longtime	No	Yes	No	No

As adjectives, long-time and longtime are synonyms defined as:

long-time and longtime: having existed or persisted or continued in a particular role or state for a long time

long-time (adjective)	longtime (adjective)
having existed or persisted or continued in a particular role or state for a long time	having existed or persisted or continued in a particular role or state for a long time