Elizabeth is unwilling to marry mr. collins because

practicing good personal hygiene will reduce the risk of getting infected, and getting a disease.   dirt, germs and parasites can accumulate under the nails, so is important to keep your nails clean and trimmed.

a dictionary contains alphabetical list of words that include the meaning, etymology and pronunciation while the thesaurus is a book that contains synonyms and even antonyms.

a dictionary explains the meaning of a word and shows how it is spelled and used. a thesaurus is a book that contains words that can be used in the place of another. unlike the dictionary the words in a thesaurus are arranged either alphabetically or thematically.