The abreviation after a word in a dictionary tell you what part of speech the word is. Such as noun (n), pronoun (pron), adjective (adj), adverb (adv), verb (vb), conjunction (conj), preposition (prep), or interjection (interj).
C) the grim outlook of the late Victorian era
We went to see our state's many lakes and rivers.
Wood is not a pure substance it is a mixture, because it is composed of compounds such as cellulose, hemicelluloses, and lignin which are made up of elements such as carbon, hydrogen, and oxygen.
Hope this helps