I never really paid much attention to online dictionaries and thesauruses before.
At least not until my computer crashed and I lost my MS Word software with my beloved spell checker!
Generally, I am a very good speller, but having some sort of spell or grammar checker is a must for all content creators. Even the best editors can sometimes overlook a misspelled or misplaced word.
I came across Thesaurus.com ages ago, but never looked into all it offered until just recently.