extension

1. A program in a university, college, or school that offers instruction, as by television or correspondence, to persons unable to attend at the usual time or in the usual place.

2. An addition that increases the area, influence, operation, or contents of something: an extension for the vacuum cleaner; built a new extension onto the hospital wing.

3. An additional telephone connected to a main line.

4. An allowance of extra time, as for the repayment of a debt.

5. Computer Science A set of characters that follow a filename and are separated from it by a period, used to identify the kind of file: In most operating systems, file names having the extension .EXE are executable files.

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Here are some other words you could make with the letters extension, you can also
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Top Words by points	Points	Word Game
extension	16	Scrabble

2 Letters	Scrabble® Points
en	2
es	2
et	2
ex	9
in	2
is	2
it	2
ne	2
no	2
oe	2
oi	2
on	2
os	2
ox	9
si	2
so	2
te	2
ti	2
to	2
xi	9

3 Letters	Scrabble® Points
ens	3
eon	3
est	3
inn	3
ins	3
ion	3
its	3
nee	3
net	3
nit	3
nix	10
nos	3
not	3
oes	3
one	3
ons	3
ose	3
see	3
sei	3
sen	3
set	3
sex	10
sin	3
sit	3
six	10
son	3
sot	3
sox	10
tee	3
ten	3
tes	3
tie	3
tin	3
tis	3
tix	10
toe	3
ton	3
xis	10

4 Letters	Scrabble® Points
eons	4
esne	4
exes	11
exit	11
exon	11
inns	4
into	4
ions	4
nene	4
neon	4
nest	4
nets	4
next	11
nine	4
nite	4
nits	4
nixe	11
noes	4
none	4
noni	4
nose	4
note	4
ones	4
oxen	11
oxes	11
seen	4
sene	4
sent	4
sext	11
sine	4
site	4
snit	4
snot	4
sone	4
teen	4
tees	4
tein	4
tens	4
ties	4
tine	4
tins	4
toes	4
tone	4
tons	4

5 Letters	Scrabble® Points
eosin	5
exine	12
exist	12
exits	12
exons	12
inset	5
neist	5
nenes	5
neons	5
nexts	12
nines	5
nites	5
niton	5
nixes	12
noise	5
nones	5
nonet	5
nonis	5
notes	5
onset	5
seine	5
sente	5
senti	5
seton	5
sexto	12
sixte	12
stein	5
steno	5
stone	5
teens	5
teins	5
tenne	5
tenno	5
tenon	5
tense	5
tines	5
tones	5
tonne	5
toxin	12
xenon	12

6 Letters	Scrabble® Points
eosine	6
exines	13
intone	6
niente	6
nitons	6
nonets	6
sennet	6
sennit	6
sexton	13
sinnet	6
sonnet	6
tenesi	6
tennes	6
tennis	6
tennos	6
tenons	6
tonnes	6
toxine	13
toxins	13
xenons	13
onesie	6

7 Letters	Scrabble® Points
intense	7
intones	7
sixteen	14
tennesi	7
tennies	7
tension	7
toxines	14

9 Letters	Scrabble® Points
extension	16