As nouns the difference between aquaduct and viaduct

is that aquaduct is while viaduct is a bridge with several spans that carries road or rail traffic over a valley or other obstacles.

As nouns the difference between aptitude and altitude

is that aptitude is natural ability to acquire knowledge or skill while altitude is the absolute height of a location, usually measured from sea level.

As a noun apt

is .

As a proper noun apt

is .

As an adjective pithy is

concise and meaningful.

As adjectives the difference between apt and apposite

is that apt is suitable; appropriate; fit or fitted; suited while apposite is appropriate, relevant, well-suited; fit.

As nouns the difference between apt and apposite

is that apt is initialism of automation presses tooling|lang=en while apposite is something that is apposite.

As a proper noun APT

is initialism of Alabama Public Television|lang=en.

As nouns the difference between apse and apsidiole

is that apse is a semicircular projection from a building, especially the rounded east end of a church that contains the altar while apsidiole is an alternative form of lang=en.

As a noun apricot

is a round sweet and juicy stone fruit, resembling peach or plum in taste, with a yellow-orange flesh, lightly fuzzy skin and a large seed inside.

As an adjective apricot

is of a pale yellowish-orange colour, like that of an apricot.

As a proper noun apple is

a nickname for new york city, usually “the big apple”.

As adverbs the difference between approximately and substantially

is that approximately is imprecise but close to in quantity or amount while substantially is in a strong substantial manner; considerably.

As an adverb approximately

is imprecise but close to in quantity or amount.

As a verb correspond is

to be equivalent or similar in character, quantity, quality, origin, structure, function etc.

As a noun approvement

is (obsolete|old english law) improvement of common lands by converting them for advantage of the landlord.

As an adjective unapproved is

not approved.

As verbs the difference between approved and concurred

is that approved is past tense of approve while concurred is past tense of concur.

As an adjective approved

is having received approval.