steering system vs steering mechanism

steering system and steering mechanism both are nouns.

Word	Noun	Adjective	Verb	Adverb
steering system	Yes	No	No	No
steering mechanism	Yes	No	No	No

As nouns, steering system and steering mechanism are synonyms defined as:

steering system and steering mechanism: a mechanism by which something is steered (especially a motor vehicle)

steering system (noun)	steering mechanism (noun)
a mechanism by which something is steered (especially a motor vehicle)	a mechanism by which something is steered (especially a motor vehicle)