Neologisms for "nut", *pech, and "hazel", *pechol, and "buckwheat", *nelio or *neilof, depending on how old the compund is.
Q. pekkuvo, of "nut" and "hide/hider". The second part is kuvo, and the first part might be *pekko, as guessed by +Tamas Ferencz . If this is from CE PEK + -ko, then > pekkho > pekcho > pechcho > pech (as perceived also be +Matt Dinse ). Hazel in Early Q. is kottule (lit. nut-bearer) of CE kote "nut" and tule bear, carry_ (with hapology). Following the same pattern with newer roots, *pekko + KOL "carry, bear" (+ some suffix, like -ne) > pekkokol(ne) > pekkolne (hapology), pekkolle, pekcholl > pechcholl > pechol.
*nelio from NEL "three" and iau, "corn" from CE jâbe with the connotation of both "three" and "triangle" due to the triangular shapes of the seeds, and neldor, "beech-tree", the latter due to the likeness of (small versions of) the seeds of the beech-tree, which is also the etymology of "buckwheat" in germanic languages like German, English, Swedish and Dutch. If in Old to Middle S, then neliôv > *neilov, with final form *neilof.