Disclaimer: My comments have nothing to do with biblical interpretations, just Latin grammar.
The words masculus and masculo are essentially the same thing, both meaning man. Latin is very precise about which ending is used depending on how the word is used in the sentence, since sentence order is largely irrelevant. The loose analogy in English would be to look at "he runs" and "I run" and interpret "run" and "runs" to have different meanings.
In this case, "masculo" is being used because it's being used as "cum masculo" - "with a man" and "pro masculo" - "for a man". It's what's referred to as the ablative declension, and is used with most conjunctions. "Masculus", meanwhile, is the singular nominative, meaning that it is the subject of the sentence (and yes, given what I said before, that means you can say, "Masculus vivit," or, "Vivit masculus," and they both mean "The man lives.").
The forms you'd want to look for, were you trying to find all iterations of masculus in a Latin work, would be:
Disclaimer: My comments have nothing to do with biblical interpretations, just Latin grammar.
The words masculus and masculo are essentially the same thing, both meaning man. Latin is very precise about which ending is used depending on how the word is used in the sentence, since sentence order is largely irrelevant. The loose analogy in English would be to look at "he runs" and "I run" and interpret "run" and "runs" to have different meanings.
In this case, "masculo" is being used because it's being used as "cum masculo" - "with a man" and "pro masculo" - "for a man". It's what's referred to as the ablative declension, and is used with most conjunctions. "Masculus", meanwhile, is the singular nominative, meaning that it is the subject of the sentence (and yes, given what I said before, that means you can say, "Masculus vivit," or, "Vivit masculus," and they both mean "The man lives.").
The forms you'd want to look for, were you trying to find all iterations of masculus in a Latin work, would be:
masculus
mascule
masculum
masculi
masculo
masculos
masculorum
masculis
I hope this helps further your understanding of Latin!
-Cassandrus