The word "budding" describes a bush that is producing new growth or buds.
It could be malingering.
D.A verb form that ends in -ing and acts as a noun
Depending upon the context, the word is either a Gerund or a Participle. (However, only some Participles end in -ing. Some end in -ed.)
You double the consonant before adding "ing" to a word that has a short vowel sound and ends with a single consonant if the consonant is preceded by a single vowel. This helps to keep the pronunciation of the word consistent.
"Running" is a verb that ends in -ing and can also function as a noun, such as in the sentence "Running is good exercise."
Duckling.
meowing and annoying
Ingurgitating means overeat or eat immodestly; is a word that starts and ends with ing.
apex a verb form that ends in -ing and acts as an adjective
D.A verb form that ends in -ing and acts as a noun
not BEING dumb
writing
"Sucking."
Cussing
It could be malingering.
Matching
x-raying