Yes, richen is in the scrabble dictionary

...and is worth 12 points by itself.

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Richen Definition

verb-transitive

To make rich.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To make rich or .
from Free Scrabble Dictionary

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Top Words by points

Points

incher

11

2 letter words with RICHEN

Points

ne

2

eh

5

en

2

er

2

in

2

re

2

he

5

hi

5

3 letter words with RICHEN

Points

her

6

ire

3

ich

8

ice

5

rec

5

rei

3

hin

6

hie

6

hic

8

hen

6

rin

3

ern

3

chi

8

4 letter words with RICHEN

Points

chin

9

rein

4

rice

6

rich

9

nice

6

inch

9

hire

7

hern

7

heir

7

cire

6

cine

6

5 letter words with RICHEN

Points

nicer

7

niche

10

chine

10

6 letter words with RICHEN

Points

incher

11

enrich

11

richen

11

Found 38 words in 0.1811 seconds