Wiktionary knows where words come from but buries it in prose. Etymologue pulls the graph out and lets you move around in it: 396,192 English words, 722,472 lexemes, 3,025 languages, 240,011 links between them. Pick an origin language and see everything English took from it; open a Latin root and walk forward to its descendants rather than backward to its parents. That reverse direction is the part no dictionary gives you.