As nouns the difference between grumble and complaints

is that grumble is a low thundering, rumbling or growling sound while complaints is plural of lang=en.

As a verb grumble

is to make a low, growling or rumbling noise, like a hungry stomach or certain animals.

As a verb propelling

is .

As a noun motivation is

(label) motivation.

As an adjective systematic

is carried out using a planned, ordered procedure.

As a verb systematized is

past tense of systematize.

As adjectives the difference between systematic and synthetic

is that systematic is carried out using a planned, ordered procedure while synthetic is of, or relating to synthesis.

As a noun synthetic is

a synthetic compound.

As adjectives the difference between subsequent and contiguous

is that subsequent is following in time; coming or being after something else at any time, indefinitely while contiguous is connected; touching; abutting.

As a verb prescribe

is to order (a drug or medical device) for use by a particular patient.

As a noun add is

.

As verbs the difference between prescribe and implement

is that prescribe is to order (a drug or medical device) for use by a particular patient while implement is to bring about; to put into practice.

As a noun implement is

a tool or instrument for working with.

In archaic terms the difference between maw and craw

is that maw is the stomach, especially of an animal while craw is to caw, crow, for certain birds to make their cry.

As a verb craw is

to caw, crow, for certain birds to make their cry.

As verbs the difference between prescribe and create

is that prescribe is to order (a drug or medical device) for use by a particular patient while create is (lb).

As a noun courage

is courage.

As an adjective braver is

(brave).