Yes, tinnier is in the scrabble dictionary

...and is worth 9 points by itself.

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Tinnier Definition

adjective

Comparative form of tinny.

from the English-language Wiktionary

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Top Words by points	Points
tinnier	7

2 letter words with TINNIER	Points
er	2
ti	2
te	2
re	2
en	2
ne	2
in	2
et	2
it	2

3 letter words with TINNIER	Points
ern	3
tie	3
tin	3
inn	3
rei	3
nit	3
net	3
ret	3
rin	3
ten	3
ire	3

4 letter words with TINNIER	Points
rein	4
rent	4
rite	4
nite	4
nine	4
tein	4
tern	4
tier	4
tine	4
tire	4
inti	4

5 letter words with TINNIER	Points
trine	5
nitre	5
renin	5
niter	5
niner	5
inter	5
innie	5
inner	5
inert	5

6 letter words with TINNIER	Points
intine	6
intern	6
tinier	6
tinner	6

7 letter words with TINNIER	Points
tinnier	7

Found 45 words in 0.23202 seconds