desk dictionary vs dictionary

desk dictionary and dictionary both are nouns.

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

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

desk dictionary: an abridged dictionary of a size convenient to hold in the hand
dictionary: a reference book containing an alphabetical list of words with information about them

Other hypernyms of desk dictionary include lexicon.

desk dictionary (noun)	dictionary (noun)
an abridged dictionary of a size convenient to hold in the hand	a reference book containing an alphabetical list of words with information about them