pro tem vs pro tempore

pro tem and pro tempore both are adjectives.

Word	Noun	Adjective	Verb	Adverb
pro tem	No	Yes	No	Yes
pro tempore	No	Yes	No	Yes

As adjectives, pro tem and pro tempore are synonyms defined as:

As adverbs, pro tem and pro tempore are synonyms defined as:

pro tem (adjective)	pro tempore (adjective)
for the time being	for the time being

pro tem (adverb)	pro tempore (adverb)
for the time being; temporarily	for the time being; temporarily