Yes, situp is in the scrabble dictionary

...and is worth 9 points by itself.

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Situp Definition

noun

Alternative spelling of sit-up.

from the English-language Wiktionary

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Here are some other words you could make with the letters SITUP, you can also
use this lookup tool to help you find words with our scrabble word finder.

Top Words by points	Points
situp	7

2 letter words with SITUP	Points
it	2
is	2
pi	4
ut	2
us	2
up	4
ti	2
si	2

3 letter words with SITUP	Points
uts	3
ups	5
tup	5
tui	3
tis	3
tip	5
sup	5
sit	3
pst	5
its	3
pis	5
pit	5
piu	5
psi	5
sip	5
pus	5
put	5

4 letter words with SITUP	Points
pits	6
tips	6
tuis	4
tups	6
ptui	6
suit	4
spit	6
puts	6

5 letter words with SITUP	Points
situp	7

Found 34 words in 0.14389 seconds