Throb and Thud

Throb verb - To expand and contract in a rhythmic manner.

Thud and throb are semantically related in pulsation topic. In some cases you can use "Thud" instead the word "Throb" as a verb or a noun, when it comes to topics like pulsate.

Thud verb - To come into usually forceful contact with something.

Throb and thud are semantically related in crash topic. You can use "Throb" instead the word "Thud" as a verb or a noun.