oil rigger vs rigger

oil rigger and rigger both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil rigger	Yes	No	No	No
rigger	Yes	No	No	No

As nouns, oil rigger and rigger are synonyms defined as:

oil rigger (noun)	rigger (noun)
someone who works on an oil rig	a long slender pointed sable brush used by artists
	a sailing vessel with a specified rig
	someone who rigs ships
	someone who works on an oil rig