exercise vs development

exercise and development both are nouns.

Word	Noun	Adjective	Verb	Adverb
exercise	Yes	No	Yes	No
development	Yes	No	No	No

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

exercise: the act of using
development: the act of making some area of land or water more profitable or productive or useful

Other hyponyms of exercise include practice, play, abuse, misuse, exploitation, recycling, application, practical application.

exercise (noun)	development (noun)
the activity of exerting your muscles in various ways to keep fit	act of improving by expanding or enlarging or refining
a task performed or problem solved in order to develop skill or understanding	the act of making some area of land or water more profitable or productive or useful
systematic training by multiple repetitions	(music) the section of a composition or movement (especially in sonata form) where the major musical themes are developed and elaborated
the act of using	a recent event that has some relevance for the present situation
an action, often used negatively and without consequences	a district that has been developed to serve some purpose
(usually plural) a ceremony that involves processions and speeches	processing a photosensitive material in order to make an image visible
	(biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level
	a process in which something passes by degrees to a different stage (especially a more advanced or mature stage)
	a state in which things are improving; the result of developing (as in the early part of a game of chess)

exercise (verb)	development (verb)
do physical exercise
give a workout to
learn by repetition
put to use
carry out or practice; as of jobs and professions