Yes, retune is in the scrabble dictionary

...and is worth 8 points by itself.

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Retune Definition

verb

To tune again.

from the English-language Wiktionary

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Here are some other words you could make with the letters RETUNE, you can also
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Top Words by points	Points
tenure	6

2 letter words with RETUNE	Points
er	2
re	2
te	2
nu	2
ne	2
un	2
ut	2
en	2
et	2

3 letter words with RETUNE	Points
tun	3
urn	3
ten	3
tee	3
rut	3
ute	3
run	3
rue	3
ree	3
ere	3
ern	3
nee	3
net	3
nut	3
ret	3

4 letter words with RETUNE	Points
tune	4
erne	4
turn	4
runt	4
true	4
tree	4
tern	4
teen	4
rent	4
rete	4
rune	4

5 letter words with RETUNE	Points
enure	5
terne	5
treen	5
tuner	5
enter	5
rente	5

6 letter words with RETUNE	Points
tenure	6
tureen	6
retune	6
neuter	6

Found 45 words in 0.17147 seconds