突 is a Chinese hanzi, listed here under the keyword “suddenly”. It is built from 穴 (cave) and 犬 (dog). It appears as a component in 6 other characters in this index.
On KumiJi Glyph Explorer, open the parts search and type “cave” + “dog”. 突 is among the results, together with every other character containing the same shapes.
Open 突 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.