firstborn vs 1st
1st vs firstbornfirstborn is a noun but 1st is not a noun.
firstborn and 1st both are adjectives.
| Word | Noun | Adjective | Verb | Adverb |
|---|---|---|---|---|
| firstborn | Yes | Yes | No | No |
| 1st | No | Yes | No | No |
| firstborn (noun) | 1st (noun) |
|---|---|
| the offspring who came first in the order of birth |
| firstborn (adjective) | 1st (adjective) |
|---|---|
| first in order of birth | preceding all others in time or space or degree |
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