Yes, rosins is a Scrabble word!

...and is worth 6 points in Scrabble, and 7 points in Words with Friends

rosins

Verb

1. Rub rosin onto

Noun

1. Any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules

What Scrabble words can I make with the letters in rosins?

5 Letter Words

irons
noirs
noris
ornis
rosin
sorns

4 Letter Words

inro
ions
iron
noir
nori
rins
sins
sirs
sons
sori
sorn
sris

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Words that can be created with an extra letter added to rosins:

C:incrossE:seniorssonsierG:grisonssignorssoringsF:frissonO:orisonsP:prisonsspinors