Yes, senior is in the scrabble dictionary

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Senior Definition

noun

A person who is older than another: She is eight years my senior.
from The American Heritage Dictionary of the English Language, 4th Edition
A senior citizen.
from The American Heritage Dictionary of the English Language, 4th Edition
A student in the fourth year of high school or college.
from The American Heritage Dictionary of the English Language, 4th Edition
One that is of a higher position, rank, or grade than another in the same set or class.
from The American Heritage Dictionary of the English Language, 4th Edition
A person older than another .
from Free Scrabble Dictionary

adjective

Being in a position, rank, or grade above others of the same set or class: a senior officer; the senior ship in the battle group.
from The American Heritage Dictionary of the English Language, 4th Edition
Having precedence in making certain decisions.
from The American Heritage Dictionary of the English Language, 4th Edition
Of or being the older of two, especially the older of two persons having the same name, as father and son.
from The American Heritage Dictionary of the English Language, 4th Edition
Of or relating to senior citizens. See Usage Note at old.
from The American Heritage Dictionary of the English Language, 4th Edition
Of or relating to the fourth and last year of high school or college: our senior class.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

irones

6

2 letter words with SENIOR

Points

er

2

oe

2

oi

2

on

2

or

2

os

2

no

2

ne

2

en

2

re

2

si

2

is

2

so

2

in

2

es

2

3 letter words with SENIOR

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ors

3

sri

3

son

3

sir

3

oes

3

one

3

sin

3

ser

3

ons

3

ore

3

sen

3

ose

3

sei

3

rei

3

res

3

rin

3

roe

3

ire

3

ion

3

ins

3

ers

3

ern

3

eon

3

nos

3

nor

3

ens

3

4 letter words with SENIOR

Points

sine

4

rein

4

reis

4

reno

4

rins

4

rise

4

roes

4

rose

4

sire

4

inro

4

eons

4

eros

4

erns

4

ions

4

nose

4

nori

4

noir

4

noes

4

sorn

4

sori

4

iron

4

ones

4

ores

4

sore

4

sone

4

ires

4

5 letter words with SENIOR

Points

senor

5

noris

5

serin

5

siren

5

snore

5

eosin

5

rosin

5

risen

5

rinse

5

resin

5

renos

5

reins

5

osier

5

ornis

5

irone

5

irons

5

noirs

5

noise

5

6 letter words with SENIOR

Points

irones

6

nosier

6

senior

6

Found 88 words in 0.20088 seconds