chart vs naval chart

chart and naval chart both are nouns.

Word	Noun	Adjective	Verb	Adverb
chart	Yes	No	Yes	No
naval chart	Yes	No	No	No

As nouns, naval chart is a hyponym of chart; that is, naval chart is a word with a more specific, narrower meaning than chart:

chart: a map designed to assist navigation by air or sea
naval chart: a chart for a navigator showing the prevailing meteorological and hydrographic and navigational conditions

Other hyponyms of chart include navigational chart, pilot chart.

chart (noun)	naval chart (noun)
a map designed to assist navigation by air or sea	a chart for a navigator showing the prevailing meteorological and hydrographic and navigational conditions
a visual display of information
(usually plural) a listing of best-selling recorded music