trouble shooter vs troubleshooter

trouble shooter and troubleshooter both are nouns.

Word	Noun	Adjective	Verb	Adverb
trouble shooter	Yes	No	No	No
troubleshooter	Yes	No	No	No

As nouns, trouble shooter and troubleshooter are synonyms defined as:

trouble shooter and troubleshooter: a worker whose job is to locate and fix sources of trouble (especially in mechanical devices)

trouble shooter (noun)	troubleshooter (noun)
a worker whose job is to locate and fix sources of trouble (especially in mechanical devices)	a worker whose job is to locate and fix sources of trouble (especially in mechanical devices)