Englishfor English speakers
a
Determinative
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A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
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A is the first letter of the alphabet.
The letter "a" comes before "b".
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In some schools, an A is a very high grade.
Ron got an A on his earth science test.
heavy
Adjective
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Heavy is having a lot of weight.
This suitcase is very heavy.
—
Having a lot of seriousness
hitter
—
noun
(= batter)
(baseball) a ballplayer who is batting
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noun
(= striker)
someone who hits
a hard hitter
a fine striker of the ball
blacksmiths are good hitters