swivel pin vs kingbolt

swivel pin and kingbolt both are nouns.

Word	Noun	Adjective	Verb	Adverb
swivel pin	Yes	No	No	No
kingbolt	Yes	No	No	No

As nouns, swivel pin and kingbolt are synonyms defined as:

swivel pin and kingbolt: bolt that provides a steering joint in a motor vehicle

Other synonyms of swivel pin include kingpin.

swivel pin (noun)	kingbolt (noun)
bolt that provides a steering joint in a motor vehicle	bolt that provides a steering joint in a motor vehicle