doubt

As verbs the difference between challenge and doubt

is that challenge is while doubt is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As a noun doubt is

uncertainty, disbelief.

As verbs the difference between admit and doubt

is that admit is to allow to enter; to grant entrance, whether into a place, or into the mind, or consideration; to receive; to take while doubt is to lack confidence in; to disbelieve, question, or suspect.

As a noun doubt is

uncertainty, disbelief.

As nouns the difference between rational and doubt

is that rational is (mathematics) a rational number: a number that can be expressed as the quotient of two integers while doubt is uncertainty, disbelief.

As an adjective rational

is capable of reasoning.

As a verb doubt is

(ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As verbs the difference between rationalize and doubt

is that rationalize is to make something rational or more rational while doubt is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As a noun doubt is

uncertainty, disbelief.

As nouns the difference between rationalization and doubt

is that rationalization is the process, or result of rationalizing while doubt is uncertainty, disbelief.

As a verb doubt is

(ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

In obsolete terms the difference between vague and doubt

is that vague is a wandering; a vagary while doubt is to fill with fear; to affright.

As an adjective vague

is not clearly expressed; stated in indefinite terms.

Doubt is a related term of discuss.

In obsolete|lang=en terms the difference between doubt and discuss

is that doubt is (obsolete) to fill with fear; to affright while discuss is (obsolete) to communicate, tell, or disclose (information, a message, etc).

As verbs the difference between doubt and discuss

is that doubt is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect while discuss is (obsolete|transitive) to drive away, disperse, shake off; said especially of tumors.

As a noun doubt

is uncertainty, disbelief.

As nouns the difference between doubt and resistance

is that doubt is uncertainty, disbelief while resistance is resistance (all meanings).

As a verb doubt

is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

In obsolete|lang=en terms the difference between doubt and swing

is that doubt is (obsolete) to fill with fear; to affright while swing is (obsolete) free course; unrestrained liberty.

As nouns the difference between doubt and swing

is that doubt is uncertainty, disbelief while swing is the manner in which something is swung.

As verbs the difference between doubt and swing

is that doubt is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect while swing is to rotate about an off-centre fixed point.

Doubt is a synonym of fluctuate.

As verbs the difference between doubt and fluctuate

is that doubt is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect while fluctuate is to vary irregularly; to swing.

As a noun doubt

is uncertainty, disbelief.