Problems is a noun, the plural form of problem.
A problem is a thing, which places it in the Noun category.
The surgeon destroys part of the thalamus. However, the procedure is complicated by numbness, balance problems, or speech problems in a significant number of cases.
Speech therapy is just as the title suggests it helps the residents with speech problems and some also help with swallowing problems. The therapy identifies problems with the speech and communications and develops plans to help overcome these problems.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.