To take hold of a thing SUDDENLY, FORCIBLY, or EAGERLY. for example:
Government seized all his possession due to his illegal activity.
Panic seized us.
Swimmer was seized by a cramp.
Grab: verb and noun
to grasp suddenly, or to operate suddenly or jerkily. For example:
I am going to grab bite. (I am going to get something to eat in a hurry).
The brake is grabbing.
How does that music grab you?
Grasp: verb and noun
To hold firmly, especially with one's hand or arm, to understand.
He grasped on the tree limb with his dear life.
He couldn't grasp what we meant.
He has a thorough grasp of his subject.
Grip: verb and noun
to take a firm hold, tool
He has lost his grip on himself.
This device grips things well.
Clutch: verb and noun
to grasp tightly.
Manual transmission has a clutching movement.
Snatch: verb and noun
To seize quickly and eagerly.
Eager snatched a fish from the lake as it flied over the surface of the water.
These words are all very close in its meaning. However, sometimes the difference is
(1)the way it holds the object,
like "grasp" is by hand or arm, but "snatch" is by "claws"
(2)how it gets the object,
like "seize" is suddenly, so is "snatch", but seize is by weapon type of
power, and "snatch" is by the one's own power.
(3)some can with mechanical thing, some can not:
like "clutch" use with transmission movement, but none of the above
(4)some can be used in a conceptual situation, some cannot
like "lost grip on himself", but you can use "snatch", or "clutch"
for this type of usage.
Of course, some of them can interchange, however, even though they can be interchangeable, but it is only for specific situation, not in general. I can only give you a general idea. You should pay attention to their usage in a daily life, so you would have better idea. My saying here is only a tip of the iceberg for using these verb