As an initialism mom

is (hardware|software).

As a noun whore is

(vulgar) a prostitute.

As a verb whore is

(vulgar) to prostitute oneself.

As a noun whore is

(vulgar) a prostitute.

As a verb whore is

(vulgar) to prostitute oneself.

As nouns the difference between timidness and fear

is that timidness is the property of being timid; shyness while fear is grass.

As an abbreviation mm

is (chemistry) millimole, millimoles.

As a preposition um is

around, about (sometimes in combination with bi).

As an adverb um is

around, about.

As a conjunction um is

in order to.

In obsolete|lang=en terms the difference between history and ancient

is that history is (obsolete) to narrate or record while ancient is (obsolete) a senior; an elder; a predecessor.

As nouns the difference between history and ancient

is that history is the aggregate of past events while ancient is a person who is very old.

As a verb history

is (obsolete) to narrate or record.

As an adjective ancient is

having lasted from a remote period; having been of long duration; of great age; very old.

As a noun folk

is people.

As an adjective classical is

of or relating to the first class or rank, especially in literature or art.

As a noun folk

is people.

As an adjective traditional is

of or pertaining to tradition; derived from tradition; communicated from ancestors to descendants by word only; transmitted from age to age without writing; as, traditional opinions; traditional customs; traditional expositions of the scriptures.

As an adjective polite is

well-mannered, civilized.

As a verb polite is

(obsolete|transitive) to polish; to refine; to render polite.

As nouns the difference between tenure and incumbent

is that tenure is a status of possessing a thing or an office; an incumbency while incumbent is the current holder of an office, such as ecclesiastical benefice or an elected office.

As a verb tenure

is to grant tenure, the status of having a permanent academic position, to (someone).

As an adjective incumbent is

imposed on someone as an obligation, especially due to one's office.

As nouns the difference between iguana and newt

is that iguana is any of several members of the lizard family family: Iguanidae while newt is a small lizard-like amphibian in the family Salamandridae that lives in the water as an adult.