The prefix 'in' generally means "not" or "The opposite of", such as "Ingratitude" or "Inglorious" although there are plenty of words that have these letters that aren't the opposite of another. Here are some other options:
Zapping, zipping, zoning and zonking are words that begin with the letter z. They end with the letters ING.
Lady, Lively, lovable/likable, linger(ing), lovely
BOOMING
agingaxingbeingbringclingcuingdoingdyingeyingflinggoingicinglyingowingslingstingsuingswingthingtyingusingvyingwring
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ING---A. That is, seven letter words with 1st letter I and 2nd letter N and 3rd letter G and 7th letter A. In alphabetical order, they are: ingesta
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern -ING---I. That is, eight letter words with 2nd letter I and 3rd letter N and 4th letter G and 8th letter I. In alphabetical order, they are: gingelli gingilli ginglymi linguini
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern F--ING--. That is, eight letter words with 1st letter F and 4th letter I and 5th letter N and 6th letter G. In alphabetical order, they are: fumingly
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -ING-P--. That is, eight letter words with 2nd letter I and 3rd letter N and 4th letter G and 6th letter P. In alphabetical order, they are: wingspan
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -ING-M-. That is, seven letter words with 2nd letter I and 3rd letter N and 4th letter G and 6th letter M. In alphabetical order, they are: lingams
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -ING-T-. That is, seven letter words with 2nd letter I and 3rd letter N and 4th letter G and 6th letter T. In alphabetical order, they are: lingots
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -ING-U-. That is, seven letter words with 2nd letter I and 3rd letter N and 4th letter G and 6th letter U. In alphabetical order, they are: kingcup
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern L-ING--. That is, seven letter words with 1st letter L and 3rd letter I and 4th letter N and 5th letter G. In alphabetical order, they are: lyingly