This specific reference material tells you how to pronounce a word, and
a word's part of speech.

Assuming you had to choose between:

The answer is dictionary.

This is the only reference material which will indicate a word's pronunciation (usually using phonetical characters and separating the syllables) as well as information like its part of speech (noun, pronoun, adjective, verb, adverb, preposition, etc.); alongside, obviously, its definition(s).

For example, this is what you can find if you search the word "dictionary" (the pronunciation and part of speech are underlined):

Dictionary. noun. \ ˈdik-shə-ˌne-rē \ : A reference source in print or electronic form containing words usually alphabetically arranged along with information about their forms, pronunciations, functions, etymologies, meanings, and syntactic and idiomatic uses.

they insisted that there was not enough time to learn everything.  

explanation:

if they were going to steal the answers that is simply because they insisted that there was not enough time to learn everything.  

answer: common sense was the pamphlet that thomas paine used to convince reluctant americans to abandon the goal of reconciling with britain and to accept that independence was the only option to preserve their liberty.