Yes, costa is in the scrabble dictionary

...and is worth 8 points by itself.

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Costa Definition

noun

A part (as the midrib of a leaf or the anterior vein of an insect wing) that resembles a rib.
from Free Scrabble Dictionary

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Top Words by points

Points

costa

7

2 letter words with COSTA

Points

at

2

so

2

as

2

os

2

ta

2

to

2

3 letter words with COSTA

Points

cos

5

soc

5

sat

3

sac

5

sot

3

act

5

oca

5

oat

3

ats

3

tao

3

tas

3

cot

5

cat

5

4 letter words with COSTA

Points

soca

6

scot

6

stoa

4

tosa

4

taos

4

scat

6

oast

4

taco

6

ocas

6

oats

4

cots

6

cost

6

coat

6

cats

6

cast

6

acts

6

5 letter words with COSTA

Points

costa

7

coats

7

coast

7

ascot

7

tacos

7

Found 40 words in 0.16861 seconds