Honest gives vowel sound.
Same purpose = no article
Different purpose = use Article
Usually Article the is used with parts of body name.
My father is going to the school to meet my principal.
Same purpose: no article
Different purpose: Article is used
Generally no article before a game
Articles "A" and "AN" are used with some expressions.
For example:
Make a noise, give a warning, have a pain, have a great education etc.
We should have a bath ? every day.
A/an + verb = noun.
Usually no article required before a material noun.
Generally article A is used before a religion.