Yes, second is playable
...and is worth 11 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Second" Definition
noun
A brief interval of time; a moment. See Synonyms at moment.
A unit of time equal to one sixtieth of a minute.
An article of merchandise of inferior quality. Often used in the plural.
An utterance of endorsement, as to a parliamentary motion.
adjective
Alternate; other: every second year.
Coming next after the first in order, place, rank, time, or quality.
Having the second-highest ratio. Used of gears in a sequence.
Inferior to another; subordinate: second vice president at the bank; a leader second to none.
Music Having a lower pitch.
adverb
But for one other; save one: the second highest peak.
In the second order, place, or rank: finished second.
verb-transitive
Chiefly British To transfer (a military officer, for example) temporarily.
To attend (a duelist or a boxer) as an aide or assistant.
To endorse (a motion or nomination) as a required preliminary to discussion or vote.
To promote or encourage; reinforce.
verb
To give support or encouragement to .
To support (a fighting person or group) in combat bring up reinforcements for.
To support or assist in contention or debate.
To endorse (a motion or a nomination) so that debate or voting may begin.
To release (as a military officer) from a regularly assigned position for temporary duty with another unit or organization.
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