Yes, halloos is a Scrabble word!
...and is worth 10 points in Scrabble, and 11 points in Words with Friends
halloos
Verb
1. Urge on with shouts
2. Shout `halloo', as when greeting someone or attracting attention
Noun
1. A shout to attract attention
What Scrabble words can I make with the letters in halloos?
7 Letter Words
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words