develop vs speculate

develop and speculate both are verbs.

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

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

Other hypernyms of develop include conjecture, hypothecate, hypothesise, hypothesize, suppose, theorise, theorize.

develop (verb)	speculate (verb)
come to have or undergo a change of (physical features and attributes)	reflect deeply on a subject
grow, progress, unfold, or evolve through a process of evolution, natural growth, differentiation, or a conducive environment	to believe especially on uncertain or tentative grounds
cause to grow and differentiate in ways conforming to its natural development	talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion
happen	invest at a risk
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