The difference between Fang and Lay hands on

When used as verbs, fang means to strike or attack with the fangs, whereas lay hands on means to find, obtain or procure.

Fang is also noun with the meaning: a long, pointed canine tooth used for biting and tearing flesh.

check bellow for the other definitions of Fang and Lay hands on

Fang as a noun:

a long, pointed canine tooth used for biting and tearing flesh
Fang as a noun:

a long pointed tooth for injecting venom

Fang as a verb (transitive, dialectal, or, archaic):

To catch, capture; seize; grip; clutch; lay hold of.
Fang as a verb (transitive, dialectal, or, obsolete):

To take; receive with assent; accept.
Fang as a verb (transitive, obsolete, as a guest):

To receive with hospitality; welcome.
Fang as a verb (transitive, obsolete, a thing given or imposed):

To receive.
Fang as a verb (transitive, dialectal):

To receive or adopt into spiritual relation, as in baptism; be godfather or godmother to.

Fang as a noun (now, chiefly, dialectal, Scotland):

A grasping; capture; the act or power of seizing; hold.
Fang as a noun:

That which is seized or carried off; booty; spoils; stolen goods.
Fang as a noun:

Any projection, catch, shoot, or other thing by which hold is taken; a prehensile part or organ.
Fang as a noun (mining):

A channel cut in the rock, or a pipe of wood, used for conveying air.
Fang as a noun (rare, in the plural):

Cage-shuts.
Fang as a noun (nautical):

The coil or bend of a rope; a noose; a trap.
Fang as a noun (nautical):

The valve of a pump box.

Fang as a verb (Scotland, transitive):

To supply (a pump) with the water necessary for it to operate.

Lay hands on as a verb (idiomatic):

To find, obtain or procure.

Examples:

"If we can lay hands on some chicken wire and a black light, we can make some scary Halloween decorations."
Lay hands on as a verb (idiomatic):

To seize or assault.