bed rest vs bedrest

bed rest and bedrest both are nouns.

Word	Noun	Adjective	Verb	Adverb
bed rest	Yes	No	No	No
bedrest	Yes	No	No	No

As nouns, bed rest and bedrest are synonyms defined as:

bed rest and bedrest: confinement to bed continuously (as in the case of some sick or injured persons)

bed rest (noun)	bedrest (noun)
confinement to bed continuously (as in the case of some sick or injured persons)	confinement to bed continuously (as in the case of some sick or injured persons)