sightread vs sight-read

sightread and sight-read both are verbs.

Word	Noun	Adjective	Verb	Adverb
sightread	No	No	Yes	No
sight-read	No	No	Yes	No

As verbs, sightread and sight-read are synonyms defined as:

sightread and sight-read: perform music from a score without having seen the score before

sightread (verb)	sight-read (verb)
perform music from a score without having seen the score before	perform music from a score without having seen the score before