Flapping and Slack

Flapping noun - The motion made by flapping up and down.

Slack and flapping are semantically related In some cases you can replace term "Slack" with "Flapping", this nouns are similar.

Nearby Words: flap, flapped, flapper

Slack adjective - Failing to give proper care and attention.

Flapping and slack are semantically related in loose topic. Sometimes you can use "Flapping" instead an adjective "Slack", if it concerns topics such as shapeless.

Nearby Words: slacken, slackened, slackness, slacker, slacked