sleigh vs bobsleigh

sleigh and bobsleigh both are nouns.

Word	Noun	Adjective	Verb	Adverb
sleigh	Yes	No	Yes	No
bobsleigh	Yes	No	No	No

As nouns, bobsleigh is a hyponym of sleigh; that is, bobsleigh is a word with a more specific, narrower meaning than sleigh:

sleigh: a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow
bobsleigh: a long racing sled (for 2 or more people) with a steering mechanism

Other hyponyms of sleigh include bob, bobsled, bobsled, dog sled, dog sleigh, dogsled, luge, pung, toboggan.

sleigh (noun)	bobsleigh (noun)
a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow	a long racing sled (for 2 or more people) with a steering mechanism
	formerly two short sleds coupled together

sleigh (verb)	bobsleigh (verb)
ride (on) a sled