pilot chart vs navigational chart

pilot chart and navigational chart both are nouns.

Word	Noun	Adjective	Verb	Adverb
pilot chart	Yes	No	No	No
navigational chart	Yes	No	No	No

As nouns, pilot chart and navigational chart are synonyms defined as:

pilot chart and navigational chart: a chart for a navigator showing the prevailing meteorological and hydrographic and navigational conditions

Other synonyms of pilot chart include naval chart.

pilot chart (noun)	navigational chart (noun)
a chart for a navigator showing the prevailing meteorological and hydrographic and navigational conditions	a chart for a navigator showing the prevailing meteorological and hydrographic and navigational conditions