I've heard that the word "dog" does not have cognates in any other known language (checked with etymonline ). That is, this very common words has similar forms in other languages, Germanic, Romance, or Celtic (those that have large overlap in vocabulary etymology with English).
So my question is of two kinds:
what are some other (common?) words that -do not- share etymology with words in any other language?
what are some ways to such a search automatically? (I feel like oed.com used to allow plain old test search of any entry so that one could have looked for 'unknown' or something similar). Also are there any online English word lists that have some etymological info?