As verbs the difference between fickle and guess

is that fickle is to deceive; flatter while guess is to reach a partly (or totally) unqualified conclusion.

As an adjective fickle

is quick to change one’s opinion or allegiance; insincere; not loyal or reliable.

As a noun guess is

a prediction about the outcome of something, typically made without factual evidence or support.

As adjectives the difference between complicated and rigorous

is that complicated is difficult or convoluted while rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.

As a verb complicated

is (complicate).

As an adjective prude

is prudish.

As a noun null is

zero, nil; the cardinal number before einn.

As a verb exaggerate

is to overstate, to describe more than is fact.

As an adjective dramatic is

dramatic.

As a verb compensate

is to pay or reward someone in exchange for work done or some other consideration.

As a noun recompensation is

(legal) for personal injuries.

As verbs the difference between estimated and esteemed

is that estimated is (estimate) while esteemed is (esteem).

As an adjective esteemed is

respected, having respect or admiration from others.

As a noun labrum

is the uppermost of the mouthparts (trophi) of a typical insect, such as a cockroach typically resembles an upper lip and forms part of the roof of the mouth in such insects.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As a noun stewardship

is the rank or office of a steward.

As a proper noun solidarity is

a political movement begun in the labor unions of poland that contributed to the fall of communism in that country.

As a proper noun jaunty

is (a traditional nickname for a navy master-at-arms).

As a verb swagger is

to walk with a swaying motion; hence, to walk and act in a pompous, consequential manner.

As a noun swagger is

confidence, pride.

As nouns the difference between guerilla and militia

is that guerilla is guerrilla while militia is (in particular) an army of trained civilians, which may be an official reserve army, called upon in time of need, the entire able-bodied population of a state which may also be called upon or a private force not under government control.