a, o, b, n, c, h, m, r, t, i, u are letters that make 'mountain birch'
NT, IR, UN, ain, birch, Tai, in, AI, mount, ai, IN, MO, mountain, Bi, In, Ir, Mo, Ta, mo are words within 'mountain birch'
1 possible definitions for 'mountain birch'
Under this definition, mountain birch is a noun and has the following properties:
swamp birch, water birch, Western paper birch, Western birch, Betula fontinalis have the same meaning as 'mountain birch'
'mountain birch' can be a type of birch, birch tree.
'mountain birch' can be a member of Betula, genus Betula.