@@@ per Lokyt must be primitive because we don't see mt > nt
Primitive elvish
kam
root. fit, suit, agree, be agreeable, fit, suit, agree, be agreeable; [ᴹ√] bind, join
kambā
noun. (cupped) hand
kamta-
verb. to (make) fit, suit, accomodate, adapt
kamprū
noun. *flea
pollō
noun. ram
kainu
verb. lie down
kainu-
verb. to lie down
kanakwe
cardinal. *14
lemek
root. [unglossed]
An unglossed root in the Outline of Phonology from the early 1950s illustrating certain phonetic combinations (PE19/98), and therefore possibly not a “real” root.
mā
noun. hand
phut
root. [unglossed]
An unglossed root appearing in the second version of Tengwesta Qenderinwa (TQ2) as an etymological variation of √PUT (PE18/90).
sal
root. [unglossed], *harp(ing), lyre
The unglossed root ᴱ√SALA appeared in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. salma “lyre, small harp” and ᴱQ. salumbe “harping, music” (QL/81). The root √SAL appeared again Common Eldarin: Verb Structure from the early 1950s to illustrate the reformed perfect form of its verb Q. asálie (PE22/132), but since these later forms are unglossed it is unclear whether they have the same meaning (“✱harp(ing)”) as the earlier version of the root.
stol
root. helmet
stuk
root. [unglossed]
tig
root. [unglossed]
A root appearing in Late Notes on Verb Structure (LVS) from 1969 as the basis for the verb Q. tinga- “go (for a long while)” (PE22/157). The etymology was marked with an “X” and so was probably a transient idea (PE22/157 note #70).
graw Reconstructed
root. [unglossed], [ᴹ√] dark, swart
This root appeared as a primitive form grawa serving as the basis of the word Q. roa “bear” >> “dog” in notes on monosyllabic roots from 1968 (VT47/35); a Sindarin derivative S. graw “bear” appeared in other notes written around the same time (VT47/12). Patrick Wynne suggested that in the sense “bear” grawa might be connected to the root ᴹ√GRAWA “dark, swart” from The Etymologies of the 1930s (EtyAC/GRAWA).
The root √KAM had several distinct meanings over Tolkien’s lifetime. The first appearance of this root is as ᴱ√KAMA “lie down” in the Qenya Lexicon of the 1910s, with derivatives like ᴱQ. kama- “to lie down; (c. loc.) to endure, suffer” and ᴱQ. kamba “bed” (QL/44). Its Gnomish equivalents G. cum- “lie (down)” and G. cumli “couch” hint at a vowel shift (GL/27). In any cases, the sense “lie” was primarily assigned to the root √KAY in later writings, as indicated by the later word ᴹQ. kaima for “bed” (Ety/KAY).
There is another unglossed early root ᴱ√KAMA from the Qenya Lexicon whose derivatives are mostly different types of red flowers, but there are no signs of √KAM being used for this purpose in Tolkien’s later writing.
The next published appearance of ᴹ√KAM was in the 1930s with the gloss “bind, join” to serve as the basis for ᴹQ. okamna “diphthong” (VT44/13), which replaced (o)samna “diphthong” (< ᴹ√SAM) from The Etymologies, only to be replaced again in the 1960s by Q. ohlon (VT39/9; VT48/29). Thus the meaning “bind, join” for √KAM may have been abandoned as well.
The final published appearances of √KAM as a root were in various etymological notes from the late 1960s. In a couple notes it appeared with glosses “fit, suit, agree” and “suit, fit, be agreeable” and a derived (probably primitive) verb ✶kamta- “to (make) fit, suit, accomodate, adapt” (VT44/14). In notes associated with hands and finger written in 1968, Tolkien proposed √KAM as a replacement for √KAB “hold, contain, retain” from which the words Q. camba/S. cam “(cupped) hand” were derived (VT47/20). It also had a derived verb form camnelyes “you received it” (✱cam- “receive”), with nasal-suffixed past form camne- (VT47/21). The verb form was replaced by cambelyes, which might indicate a restoration of √KAB with nasal-infixed past form cambe- (✱cav- “receive”), as suggested by Patrick Wynne.
Neo-Eldarin: For purposes of Neo-Eldarin, I think it is best to assume that √KAM as a replacement for √KAB was a transient idea, allowing us to use √KAM with the sense “fit, suit, agree” instead.