Some seven letter words that end with 'oon' are:
maroon
monsoon, pontoon, cartoon, eftsoon, Kowloon
Cartoon Moon Noon Soon Platoon Spoon
booncoonloonnoonmoonsoon
baboon
ful-
Two- Ball Oon.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern -OON-I-. That is, seven letter words with 2nd letter O and 3rd letter O and 4th letter N and 6th letter I. In alphabetical order, they are: coontie moonlit
bra-oon-dee in Scots Gaelic.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -OON-M-. That is, seven letter words with 2nd letter O and 3rd letter O and 4th letter N and 6th letter M. In alphabetical order, they are: zoonomy
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern F---OON. That is, seven letter words with 1st letter F and 5th letter O and 6th letter O and 7th letter N. In alphabetical order, they are: festoon
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern T--OON-. That is, seven letter words with 1st letter T and 4th letter O and 5th letter O and 6th letter N. In alphabetical order, they are: tycoons