Yes, gain is playable
...and is worth 7 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Gain" Definition
noun
A notch or mortise cut into a board to receive another part.
An increase in amount or degree: a gain in operating income.
Electronics An increase in signal power, voltage, or current by an amplifier, expressed as the ratio of output to input. Also called amplification.
Progress; advancement: The country made economic gains under the new government.
Something gained or acquired: territorial gains.
idiom
Gain ground To progress, advance, or increase: Stock prices gained ground yesterday.
Gain time To delay or prolong something until a desired event occurs.
Gain time To run too fast. Used of a timepiece.
verb-transitive
To attain in competition or struggle; win: gained a decisive victory; gained control of the company.
To become fast by (a specified amount of time). Used of a timepiece: My watch gains four minutes a day.
To come to; reach: gained the top of the mountain. See Synonyms at reach.
To increase by (a specific amount): gained 15 pounds; the market gained 30 points.
verb-intransitive
To become better; improve: gaining in health.
To close a gap; get closer: The runners in the back gained steadily on the leader.
To increase; grow: gained in experience and maturity; a painting that gained in value.
To operate or run fast. Used of a timepiece.
verb
To get closer to something pursued .
To improve in health or ability.
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