As nouns the difference between halm and hawm
is that halm is stalk while hawm is (straw).
As a verb hawm is
(uk|dialect) to lounge; to loiter.
halm
English
Noun
(-)
(botany)
----
hawm
English
Etymology 1
Uncertain.
Verb
(
en verb)
(UK, dialect) To lounge; to loiter.
- (Tennyson)
Etymology 2