Depending on how it's used in a sentence, "stumble" can be either a verb or a noun.
adverb
Founder can be either a verb or a noun. Founder as a verb is to sink, as a ship founders, or to stumble or go lame, as a horse founders. Founder as a noun is a person who establishes or begins something, as the founder of a university or the founder of a nation.
what part of speech is beneath
i want to know what part of speech is camping
The part of speech is a adjective
Stumbled is a verb in the past tense.
its the sound of the pistons stroking.
Use stumble in a sentence.
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.