I see.I agree with Shirley (and others). It's difficult to explain what is wrong in some method or view if it's totally different than what you know is right. So it's difficult to explain why your question isn't the right question. But I try.
Greek was a living language. People who wrote the New Testament didn't analyse it like some of the modern interpreters do. You wouldn't handle English like you handle Biblical Greek. Try to imagine that the NT was originally written in English. How would the person who wrote something in it understand it? If it was spoken, how would the hearers understand it? You wouldn't ask if the definitions of "testify" and "convince" could be subsets of the definition of "expound". That question would be nonsense for any normal English speaker or even a language teacher who knows grammar and semantics.
I've read the introduction and I see how my approach reminded you of the "gems" described in it. I agree with how it warns about over interpretation of a word and the dangers and interpreting the meaning of word and the meaning of the passage of the word based on how the word was used in non-biblical sources, and it is not something that I ever do in bible study. I'm only interested in how the word means in a biblical context, and I understand that even solely considering how the word are used in biblical contexts it may still hold different meaning for the respective contexts that the word is used in (from the example of the "gem" finding in that book). However I do know there are instances where this approach is edifying, such as what we can learn about the definition of the word προφητεύω in the following verses:You could do yourself a service and find a copy of Moises Silva's God, Language and Scripture. Your approach reminds me of "gems" or "gold nuggets" described in the introduction of that work.
The best you can do with Greek is to learn to read it as running text, as normal communication, with flow of thought and context.
ὁ λαλῶν γλώσσῃ ἑαυτὸν οἰκοδομεῖ· ὁ δὲ προφητεύων ἐκκλησίαν οἰκοδομεῖ – 1 Corinthians 14:4
τούτῳ δὲ ἦσαν θυγατέρες παρθένοι τέσσαρες προφητεύουσαι ἐπιμενόντων δὲ ἡμῶν ἡμέρας πλείους κατῆλθέν τις ἀπὸ τῆς Ἰουδαίας προφήτης ὀνόματι Ἅγαβος καὶ ἐλθὼν πρὸς ἡμᾶς καὶ ἄρας τὴν ζώνην τοῦ Παύλου δήσας τε αὐτοῦ τὰς χεῖρας καὶ τοὺς πόδας εἶπεν Τάδε λέγει τὸ πνεῦμα τὸ ἅγιον Τὸν ἄνδρα οὗ ἐστιν ἡ ζώνη αὕτη οὕτως δήσουσιν ἐν Ἰερουσαλὴμ οἱ Ἰουδαῖοι καὶ παραδώσουσιν εἰς χεῖρας ἐθνῶν – Acts 21:9-11
I agree.I don't mean that word study or grammatical details are meaningless. But you should have a wider view first. It's also OK to have a concrete theological question as a motivator, but a theological (spiritual) motivation combined with shaky exegetical and hermeneutical foundation -- including how the Greek is handled -- and especially with predetermined convictions will lead to a house built on sand even though it may feel strong.
I'm far from perfect on what I preach, you can find me paying unwarranted attention to details and having more or less warranted convictions, but I think I have learned something. "Greek is just a normal language among others, so handle it accordingly" is one of the lessons learned.