Nouns

(n)temp, temporary, temporary workera worker (especially in an office) hired on a temporary basis

Adjectives

(a)impermanent, temporarynot permanent; not lasting“politics is an impermanent factor of life” (James Thurber), “impermanent palm cottages”, “a temporary arrangement”, “temporary housing”
(s)irregular, temporarylacking continuity or regularity“an irregular worker”, “employed on a temporary basis”