appear vs come along

appear and come along both are verbs.

Word	Noun	Adjective	Verb	Adverb
appear	No	No	Yes	No
come along	No	No	Yes	No

As verbs, appear and come along are synonyms defined as:

appear and come along: come into being or existence, or appear on the scene

appear (verb)	come along (verb)
come into sight or view	come into being or existence, or appear on the scene
be issued or published	develop in a positive way
come into being or existence, or appear on the scene
appear as a character on stage or appear in a play, etc.
give a certain impression of being something or having a certain aspect
(of a proposition) seem to be true, probable, or apparent
present oneself formally, as before a (judicial) authority