underdevelop vs develop

underdevelop and develop both are verbs.

Word	Noun	Adjective	Verb	Adverb
underdevelop	No	No	Yes	No
develop	No	No	Yes	No

As verbs, develop is a hypernym of underdevelop; that is, develop is a word with a broader meaning than underdevelop:

underdevelop: process (a film or photographic plate) less than the required time or in an ineffective solution or at an insufficiently high temperature
develop: make visible by means of chemical solutions

underdevelop (verb)	develop (verb)
process (a film or photographic plate) less than the required time or in an ineffective solution or at an insufficiently high temperature	come to have or undergo a change of (physical features and attributes)
	grow, progress, unfold, or evolve through a process of evolution, natural growth, differentiation, or a conducive environment
	cause to grow and differentiate in ways conforming to its natural development
	happen
	change the use of and make available or usable
	be gradually disclosed or unfolded; become manifest
	gain through experience
	become technologically advanced
	grow emotionally or mature
	expand in the form of a series
	elaborate by the unfolding of a musical idea and by the working out of the rhythmic and harmonic changes in the theme
	create by training and teaching
	elaborate, as of theories and hypotheses
	move into a strategically more advantageous position
	move one's pieces into strategically more advantageous positions
	superimpose a three-dimensional surface on a plane without stretching, in geometry
	work out
	make something new, such as a product or a mental or artistic creation
	generate gradually
	make visible by means of chemical solutions
	come into existence; take on form or shape