Yes, combine is playable
...and is worth 17 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Combine" Definition
noun
A power-operated harvesting machine that cuts, threshes, and cleans grain.
An association of people or groups united for the furtherance of political or commercial interests.
A especially of business or political interests.
A harvesting machine that heads, threshes, and cleans grain while moving over a field.
verb-intransitive
Chemistry To form a compound.
To become united; coalesce.
To harvest a grain crop using a cutting, threshing, and cleaning machine: "Norwegian bachelor farmers combining in their antique McCormacks” ( Garrison Keillor).
To join forces for a common purpose. See Synonyms at join.
verb-transitive
To bring into a state of unity; merge.
To harvest (a grain crop) using a cutting, threshing, and cleaning machine.
To join (two or more substances) to make a single substance, such as a chemical compound; mix.
To possess or exhibit in combination: The choreography, which combines artistry and athletics, is extremely innovative.
verb
To bring into such close relationship as to obscure individual characters .
To cause to unite into a chemical compound.
To unite into a single number or expression .
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