There are already a bunch of websites on the net that help you find synonyms for various words, but only a handful that help you find related, or even loosely associated words. If you just care about the words' direct semantic similarity to dredging, then there's probably no need for this. The frequency data is extracted from the English Wikipedia corpus, and updated regularly. You can highlight the terms by the frequency with which they occur in the written English language using the menu below. So for example, you could enter 'breading' and click 'filter', and it'd give you words that are related to dredging and breading. You can also filter the word list so it only shows words that are also related to another word of your choosing. By default, the words are sorted by relevance/relatedness, but you can also get the most common dredging terms by using the menu below, and there's also the option to sort the words alphabetically so you can get dredging words starting with a particular letter. The words at the top of the list are the ones most associated with dredging, and as you go down the relatedness becomes more slight. You can get the definition(s) of a word in the list below by tapping the question-mark icon next to it. The top 4 are: breading, barge, sediment and shovel.

Below is a massive list of dredging words - that is, words related to dredging.

Dredging synonym