The difference between Assault and Light into

When used as verbs, assault means to attack, physically or figuratively, whereas light into means to attack physically.

Assault is also noun with the meaning: a violent onset or attack with physical means, for example blows, weapons, etc.

check bellow for the other definitions of Assault and Light into

Assault as a noun:

A violent onset or attack with physical means, for example blows, weapons, etc.

Examples:

"to make assault upon a man, a house, or a town"
Assault as a noun:

A violent onset or attack with moral weapons, for example words, arguments, appeals, and the like

Examples:

"to make an assault on the [[prerogative prerogatives]] of a prince, or on the [[constitution]] of a government"
Assault as a noun (criminal, _, legal):

An attempt to commit battery: a violent attempt, or willful effort with force or violence, to do hurt to another, but without necessarily touching his person, as by lifting a fist in a threatening manner, or by striking at him and missing him.
Assault as a noun (singulare tantum, legal):

The crime whose action is such an attempt.
Assault as a noun (tort, _, legal):

An act that causes someone to apprehend imminent bodily harm.
Assault as a noun (singulare tantum, legal):

The tort whose action is such an act.
Assault as a noun (fencing):

A non-competitive combat between two fencers.

Assault as a verb (transitive):

To attack, physically or figuratively.

Examples:

"Tom was accused of assaulting another man outside a nightclub."

"Loud music assaulted our ears as we entered the building."
Assault as a verb (transitive):

To threaten or harass.