Meaning: This sentence describes a bird returning in the spring to rebuild its nest.
Choice of Words: Returns is a verb that means to come back to a place. Spring is a noun that refers to the season between winter and summer. Nest is a noun that refers to a structure built by a bird for laying and incubating eggs. Rebuilds is a verb that means to build something again after it has been damaged or destroyed. Anew is an adverb that means again or afresh.