Yes, greened is in the scrabble dictionary

...and is worth 11 points by itself.

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Greened Definition

verb

Simple past tense and past participle of green.

from the English-language Wiktionary

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Here are some other words you could make with the letters GREENED, you can also
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Top Words by points	Points
reneged	9

2 letter words with GREENED	Points
de	3
re	2
ne	2
ed	3
en	2
er	2

3 letter words with GREENED	Points
dee	4
reg	4
ree	3
red	4
neg	4
nee	3
gen	4
gee	4
ged	5
ern	3
den	4
ere	3
eng	4
end	4
erg	4

4 letter words with GREENED	Points
edge	6
deer	5
dene	5
dere	5
rede	5
nerd	5
need	5
dree	5
dreg	6
reed	5
rend	5
gree	5
gene	5
geed	6
erne	4
eger	5

5 letter words with GREENED	Points
green	6
greed	7
genre	6
ender	6
edger	7

6 letter words with GREENED	Points
renege	7
needer	7
degree	8
gender	8

7 letter words with GREENED	Points
reneged	9
greened	9

Found 48 words in 0.23107 seconds