reaction

As a verb reflect

is to bend back (light, etc) from a surface.

As a noun reaction is

.

As nouns the difference between mechanism and reaction

is that mechanism is within a machine or machinery; any mechanical means for the conversion or control of motion, or the transmission or control of power while reaction is .

As nouns the difference between observation and reaction

is that observation is the act of observing, and the fact of being observed while reaction is .

As nouns the difference between reaction and thought

is that reaction is while thought is form created in the mind, rather than the forms perceived through the five senses; an instance of thinking.

As a verb thought is

(think).

As an adjective preemptive

is .

As a noun reaction is

.

As nouns the difference between reaction and allergy

is that reaction is while allergy is (pathology|immunology) a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma.

As nouns the difference between waiver and reaction

is that waiver is the act of waiving, or not insisting on, some right, claim, or privilege while reaction is .

As a verb waiver

is .

As nouns the difference between commotion and reaction

is that commotion is a state of turbulent motion while reaction is .

As nouns the difference between take and reaction

is that take is a fog or mist while reaction is .

As nouns the difference between counteraction and reaction

is that counteraction is an act of retaliation; a counterattack while reaction is .