Yes, swear is playable
...and is worth 8 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Swear" Definition
noun
verb-transitive
Law To administer a legal oath to: All the witnesses have been sworn.
To declare or affirm solemnly by invoking a deity or a sacred person or thing.
To promise or pledge with a solemn oath; vow: He swore his oath of allegiance to the queen. See Synonyms at promise.
To say or affirm earnestly and with great conviction.
To utter or bind oneself to (an oath).
verb-intransitive
Law To give evidence or testimony under oath.
To make a solemn declaration, invoking a deity or a sacred person or thing, in confirmation of and witness to the honesty or truth of such a declaration.
To make a solemn promise; vow.
To use profane oaths; curse.
phrasal-verb
Swear at To use abusive, violent, or blasphemous language against; curse.
Swear by To have great reliance on or confidence in: He swears by his personal physician.
Swear by To take an oath by: He swore by all the angels and saints of heaven.
Swear in To administer a legal or official oath to: swear in a mayor.
Swear off Informal To pledge to renounce or give up: She has sworn off cigarettes.
verb
To utter or take solemnly (an oath).
To assert as true or promise under oath .
To assert or promise emphatically or earnestly .
To put to an oath administer an oath to.
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