Yes, enter is playable
...and is worth 6 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Enter" Definition
verb
To come or gain admission into a group .
To begin to consider a subject .
To go upon land for the purpose of taking possession.
phrasal-verb
Enter into To become a component of; form a part of: Financial matters entered into the discussion.
Enter into To become party to (a contract): The nations entered into a trade agreement.
Enter into To consider; investigate: The report entered into the effect of high interest rates on the market.
Enter into To participate in; take an active role or interest in: enter into politics; enter into negotiations.
On To begin considering; take up: After discussing the budget deficit, they entered on the problem of raising taxes.
verb-intransitive
To become a member or participant.
To come or go in; make an entry: As the President entered, the band played "Hail to the Chief.”.
verb-transitive
To become a participant, member, or part of; join: too old to enter the army; entered the discussion at a crucial moment.
To cause to become a participant, member, or part of; enroll: entered the children in private school; entered dahlias in a flower show.
To come or go into: The train entered the tunnel.
To embark on; begin: With Sputnik, the Soviet Union entered the space age.
To gain admission to (a school, for example).
We love the game of Scrabble®, which is why we created Free Scrabble Dictionary - a simple lookup tool to check if the word you want to play is valid in the game of Scrabble®. At the top of every page, you can enter your word and click "Search Dictionary." We'll let you know whether your word is playable and provide a few definitions as well.