steering mechanism vs steering system

steering mechanism and steering system both are nouns.

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

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

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

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