pocket dictionary vs dictionary

pocket dictionary and dictionary both are nouns.

Word	Noun	Adjective	Verb	Adverb
pocket dictionary	Yes	No	No	No
dictionary	Yes	No	No	No

As nouns, dictionary is a hypernym of pocket dictionary; that is, dictionary is a word with a broader meaning than pocket dictionary:

pocket dictionary: a dictionary that is small enough to carry in your pocket
dictionary: a reference book containing an alphabetical list of words with information about them

Other hypernyms of pocket dictionary include lexicon.

pocket dictionary (noun)	dictionary (noun)
a dictionary that is small enough to carry in your pocket	a reference book containing an alphabetical list of words with information about them