(s)p - (s)t
- (s)p(h)el-1
- (s)p(h)el-2
- (s)p(h)elg-
- (s)p(h)er-2, sprei-, spreu-
- (s)p(h)er-4, (s)p(h)erǝg-
- (s)p(h)ereg-, (s)p(h)erǝg-, (s)p(h)rēg- (nasal. spreng-)
- (s)p(h)eu-d-
- (s)p(h)ē̆i-1 : (s)p(h)ī̆-
- (s)p(h)i̯ēu- : (s)pi̯ū-, (s)pīu̯ - (*ps(h)i̯ēu- < -ĝʷhi̯ēu -)
- (s)pel-
- (s)pen-1(d-)
- (s)per-1
- (s)pingo-
- (s)pī̆ ko-