The difference between Assemble and Build

When used as verbs, assemble means to put together, whereas build means to form (something) by combining materials or parts.

Build is also noun with the meaning: the physique of a human body.

check bellow for the other definitions of Assemble and Build

Assemble as a verb (transitive):

To put together.

Examples:

"He assembled the model ship."
Assemble as a verb (ambitransitive):

To gather as a group.

Examples:

"The parents assembled in the school hall."
Assemble as a verb (computing):

to translate from assembly language to machine code

Build as a verb (transitive):

To form (something) by combining materials or parts.
Build as a verb (transitive):

To develop or give form to (something) according to a plan or process.
Build as a verb (transitive):

To increase or strengthen (something) by adding gradually to.
Build as a verb (transitive):

To establish a basis for (something).
Build as a verb (intransitive):

To form by combining materials or parts.
Build as a verb (intransitive):

To develop in magnitude or extent.
Build as a verb (transitive, computing):

To construct (software) by compiling its source code.
Build as a verb (intransitive, computing, of [[source code]]):

To be converted into software by compilation, usually with minimal human intervention.

Examples:

"This code won't build any more. Have you made any changes?"

Build as a noun (countable, uncountable):

The physique of a human body; constitution or structure of a human body.

Examples:

"Rugby players are of sturdy build."
Build as a noun (computing, countable):

Any of various versions of a software product as it is being developed for release to users.

Examples:

"The computer company has introduced a new prototype build to beta testers."
Build as a noun (video games, slang, countable):

Any structure, such as a building, statue, pool or forest, created by the player.

Examples:

"I made a build that looked like the Parthenon in that game."