opportunist vs opportunistic

opportunist is a noun but opportunistic is not a noun.

Word	Noun	Adjective	Verb	Adverb
opportunist	Yes	Yes	No	No
opportunistic	No	Yes	No	No

As adjectives, opportunist and opportunistic are synonyms defined as:

opportunist and opportunistic: taking immediate advantage, often unethically, of any circumstance of possible benefit

Other synonyms of opportunist include timeserving.

opportunist (noun)	opportunistic (noun)
a person who places expediency above principle

opportunist (adjective)	opportunistic (adjective)
taking immediate advantage, often unethically, of any circumstance of possible benefit	taking immediate advantage, often unethically, of any circumstance of possible benefit