sightsing vs sight-sing

sightsing and sight-sing both are verbs.

Word	Noun	Adjective	Verb	Adverb
sightsing	No	No	Yes	No
sight-sing	No	No	Yes	No

As verbs, sightsing and sight-sing are synonyms defined as:

sightsing and sight-sing: sing from a score without having seen it before

sightsing (verb)	sight-sing (verb)
sing from a score without having seen it before	sing from a score without having seen it before