Yes, preserve is playable
...and is worth 15 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Preserve" Definition
noun
An area maintained for the protection of wildlife or natural resources.
Fruit cooked with sugar to protect against decay or fermentation. Often used in the plural.
Something considered as being the exclusive province of certain persons: Ancient Greek is the preserve of scholars.
Something that acts to preserve; a preservative.
Fruit canned or made into jams or jellies or cooked whole or in large pieces in a syrup so as to keep its shape .
verb-transitive
To keep in perfect or unaltered condition; maintain unchanged.
To keep or maintain intact: tried to preserve family harmony. See Synonyms at defend.
To maintain in safety from injury, peril, or harm; protect.
To prepare (food) for future use, as by canning or salting.
To prevent (organic bodies) from decaying or spoiling.
verb-intransitive
To maintain a private area stocked with game or fish.
To treat fruit or other foods so as to prevent decay.
verb
To keep safe from injury, harm, or destruction .
To keep alive, intact, or free from decay.
To keep or save from decomposition.
To can, pickle, or similarly prepare for future use.
To keep up and reserve for personal or special use.
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