The difference between Concur and Crowd

When used as verbs, concur means to unite or agree (in action or opinion), whereas crowd means to press forward.

Crowd is also noun with the meaning: a group of people congregated or collected into a close body without order.

check bellow for the other definitions of Concur and Crowd

Concur as a verb:

To unite or agree (in action or opinion); to have a common opinion; to coincide; to correspond.
Concur as a verb:

To meet in the same point; to combine or conjoin; to contribute or help towards a common object or effect.
Concur as a verb (obsolete):

To run together; to meet.
Concur as a verb (rare):

To converge.

Crowd as a verb (intransitive):

To press forward; to advance by pushing.

Examples:

"The man crowded into the packed room."
Crowd as a verb (intransitive):

To press together or collect in numbers

Examples:

"They crowded through the archway and into the park."

"synonyms: swarm throng crowd in"
Crowd as a verb (transitive):

To press or drive together, especially into a small space; to cram.

Examples:

"He tried to crowd too many cows into the cow-pen."
Crowd as a verb (transitive):

To fill by pressing or thronging together
Crowd as a verb (transitive, often used with "out of" or "off"):

To push, to press, to shove.

Examples:

"They tried to crowd her off the sidewalk."
Crowd as a verb (nautical):

To approach another ship too closely when it has right of way.
Crowd as a verb (nautical, of a, square-rigged ship, transitive):

To carry excessive sail in the hope of moving faster.
Crowd as a verb (transitive):

To press by solicitation; to urge; to dun; hence, to treat discourteously or unreasonably.

Crowd as a noun:

A group of people congregated or collected into a close body without order.

Examples:

"After the movie let out, a crowd of people pushed through the exit doors."
Crowd as a noun:

Several things collected or closely pressed together; also, some things adjacent to each other.

Examples:

"There was a crowd of toys pushed beneath the couch where the children were playing."
Crowd as a noun (with definite article):

The so-called lower orders of people; the populace, vulgar.
Crowd as a noun:

A group of people united or at least characterised by a common interest.

Examples:

"That obscure author's fans were a nerdy crowd which hardly ever interacted before the Internet age."

Crowd as a verb (obsolete, intransitive):

To play on a crowd; to fiddle.