As nouns the difference between first and then

is that first is ridge (of roof) while then is that time.

As an adverb then is

(label) at that time.

As an adjective then is

being so at that time.

As a conjunction then is

.

In transitive terms the difference between must and eat

is that must is to make musty while eat is to destroy, consume, or use up.

As verbs the difference between must and eat

is that must is to do with certainty; indicates that the speaker is certain that the subject will have executed the predicateeat is to ingest; to be ingested.

As a noun must

is something that is mandatory or required.

As adjectives the difference between chary and meticulous

is that chary is sad; sorrowful; grievous while meticulous is timid, fearful, overly cautious.

In anatomy|lang=en terms the difference between hindbrain and metencephalon

is that hindbrain is (anatomy) the posterior part of the brain, comprising the cerebellum, pons and medulla, the rhombencephalon while metencephalon is (anatomy) the portion of the embryonic rhombencephalon from which the pons and cerebellum arise.

As nouns the difference between hindbrain and metencephalon

is that hindbrain is (anatomy) the posterior part of the brain, comprising the cerebellum, pons and medulla, the rhombencephalon while metencephalon is (anatomy) the portion of the embryonic rhombencephalon from which the pons and cerebellum arise.

As nouns the difference between brand and stain

is that brand is a piece of wood red-hot, or still burning, from the fire while stain is a discoloured spot or area.

As verbs the difference between brand and stain

is that brand is to burn the flesh with a hot iron, either as a marker (for criminals, slaves etc.) or to cauterise a wound while stain is to discolour something.

As an adjective brand

is associated with a particular product, service, or company.

As a noun merchandiser

is a trader or merchant, especially in the retail trade.

As a verb marketer is

(label) to market.

As a noun whoop

is an exclamation, a cry, usually of joy.

As a verb whoop

is to make a whoop or whoop can be (informal) to beat, to strike.

As an initialism oops is

object-oriented programming system.

As interjections the difference between bah and oh

is that bah is Expressing contempt, disgust, or bad temper.oh is expression of surprise.

As an abbreviation OH is

ohio, a state of the United States of America.

As a noun oh is

the letter O, o (more commonly spelled o.

As a verb oh is

to utter the interjection oh; to express surprise, etc.

As verbs the difference between clog and inhibit

is that clog is to block or slow passage through (often with 'up' ) while inhibit is to hinder; to restrain.

As a noun clog

is a type of shoe with an inflexible, often wooden sole sometimes with an open heel.

As adjectives the difference between local and civil

is that local is from or in a nearby location while civil is (uncomparable) having to do with people and government office as opposed to the military or religion.

As a noun local

is a person who lives nearby.