As nouns the difference between lurker and larker
is that lurker is agent noun of lurk; one who lurks while larker is a catcher of larks (the bird).
lurker
English
Noun
(
en noun)
Agent noun of lurk; one who lurks.
# (Internet) A user who observes a community rather than participating; someone who reads or takes advantage of content on a website, newsgroup, etc. but does not contribute.
(archaic, UK, dialect) A small fishing-boat.
larker
English
Noun
(
en noun)
A catcher of larks (the bird).
One who indulges in a lark or frolic.