A noun is a word that names a person, animal, place, idea, emotion, feeling, among others. In the sentence, there are three nouns: Jake, swimming, and lake.
Jake names a person; swimming, although it looks like a verb, it is actually a noun and it refers to the act, art, or practice of one that swims; and lake names a thing, or a large area of water.
The other words of the sentence do not act as a noun but as others parts of speech: likes is a verb, in is a preposition, the is an article and wide is an adjective.