not BEING dumb
Ingurgitating means overeat or eat immodestly; is a word that starts and ends with ing.
Duckling.
meowing and annoying
Cussing
"Sucking."
It could be malingering.
writing
Matching
x-raying
ing
Gerunds are another word for the -ing words used in diamante poems. Gerunds are verbs that act as nouns by adding the -ing suffix.
Depending upon the context, the word is either a Gerund or a Participle. (However, only some Participles end in -ing. Some end in -ed.)