墳 is a Japanese kanji written with 15 strokes, listed here under the keyword “tomb”. It is built from 土 (soil) and 賁 (pitchfork). In Remembering the Kanji by James W. Heisig it is frame 1282.
On KumiJi Glyph Explorer, open the parts search and type “soil” + “pitchfork”. 墳 is among the results, together with every other character containing the same shapes.
Open 墳 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.