litter vs sedan chair

litter and sedan chair both are nouns.

Word	Noun	Adjective	Verb	Adverb
litter	Yes	No	Yes	No
sedan chair	Yes	No	No	No

As nouns, sedan chair is a hyponym of litter; that is, sedan chair is a word with a more specific, narrower meaning than litter:

litter: conveyance consisting of a chair or bed carried on two poles by bearers
sedan chair: a closed litter for one passenger

Other hyponyms of litter include covered couch, palankeen, palanquin, sedan, stretcher.

litter (noun)	sedan chair (noun)
material used to provide a bed for animals	a closed litter for one passenger
conveyance consisting of a chair or bed carried on two poles by bearers
the offspring at one birth of a multiparous mammal
rubbish carelessly dropped or left about (especially in public places)

litter (verb)	sedan chair (verb)
give birth to a litter of animals
make a place messy by strewing garbage around
strew