Yes, grow is playable
...and is worth 9 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Grow" Definition
phrasal-verb
Grow into To develop or change so as to fit: She grew into her job. He grew into the relationship slowly.
Grow into To develop so as to become: A boy grows into a man.
Grow up To become an adult.
On To become gradually more evident to: A feeling of distrust grew on me.
On To become gradually more pleasurable or acceptable to: a taste that grows on a person.
idiom
Grow out of To develop or come into existence from: an article that grew out of a few scribbled notes.
verb-transitive
To allow (something) to develop or increase by a natural process: grow a beard.
To cause to grow; raise: grow tulips.
Usage Problem To cause to increase or expand by concerted effort: strategies that grew the family business.
verb-intransitive
To be capable of growth; thrive: a plant that grows in shade.
To become attached by or as if by the process of growth: tree trunks that had grown together.
To come into existence from a source; spring up: love that grew from friendship.
To come to be by a gradual process or by degrees; become: grow angry; grow closer.
To develop and reach maturity.
verb
To spring up and develop to maturity.
To be able to grow in some place or situation.
To assume some relation through or as if through a process of natural.
To increase in size by assimilation of material into the living organism or by accretion of material in a nonbiological process (as crystallization).
To develop from a parent source.
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