This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of gain.

n. That which one gains, as by labor, industry, successful enterprise, and the like: usually in the plural.

"Pico reef: Another term gaining popularity is pico reef, which is used to refer to nano reef aquariums of three gallons or less."

to gain upon   

loss   

gained    gaines    gaining    gains   

increase    climb    mount    rise    wax   

acquisition    benefit    profit    incur    reach    wink    to gain over    law of greatest gain    to gain the wind    to gain the bell   

steal    tally    hit    rack up    score    scale    get at    peak    culminate    ground   

autogain   

convenient    suitable    direct    near    handy    dexterous    easy    profitable    cheap    respectable   

Alane    Aquitaine    Ayn    Bahrain    Biscayne    Blaine    Cain    Chain    Champagne    Champaign   

Memes   

profit    increase    loss    benefit    wealth    investment    rate    return    decline    success