I'm afraid that the one who doesn't understand is you. You really should stop playing with Greek because you don't know what you're talking about. Just because a word doesn't have a Strong's number doesn't mean that it's not implied by the word that comes before it.
The Greek words found in your three examples above are pneumatikon, pneumatika, and pneumaton respectively. The first two are plural adjectives and the last is a plural noun. All three are literally translated 'sprituals.' This is not proper English so a word like 'things,' 'graces,' or 'gifts' must be added in order for the English reader to understand what is meant by the term 'spirituals.' There's even a list of these 'spirituals' in your 1 Cor. 12 example that Paul calls a 'manifestation of the spirit.'
Your strange denial of spiritual gifts just doesn't hold water. You really should leave Greek translation to those who know what they are doing and stop insulting people by telling them they're stupid and have no credibility because you're certainly no one to talk.
What is strange is your continued effort to provide cover for your false religion, which touts non-existent 'spiritual gifts'. Your knowledge of Greek only further proves your lack of knowledge of Bible. You overlook a very important point, which renders your entire argument moot. One first has to determine whether the scriptures in debate are Paul's human writings or are the God-inspired Word of God.
If your position [necessary to add the word 'gifts'] had any merit, then you run into trouble here -
Rom 1:11 For I long to see you, that I may impart unto you some spiritual gift, to the end ye may be established;
Paul, under inspiration of God, included the word 'gift' [Greek charisma] as the word 'spiritual' is an adjective in this case. Yet, in 1 Cor. 12:1 and 14:1, Paul, under inspiration of God, did not include the word 'gift' thereafter. If your point is correct, one has to logically conclude that either (1) Paul was not inspired by God as he was neglectful to add the word 'gifts' to 12:1 and 12:14 [the word 'things' in other usages of pneumatikos]; (2) God screwed up and forgot to have Paul write the object to which the adjective pneumatikos describes [absent an object, it could describe anything]; or (3) You are in error as the word 'spiritual' is not an adjective in 12:1 and 14:1.
If you conclude that the scriptures are Paul's human hand and that Paul screwed up by forgetting to write 'gifts' into 12:1 and 14:1, then there would be no basis for making a religion out of any of the Pauline letters as Paul was not inspired of God. Your religion would be, by default, a non-Christian religion as it is premised upon non-inspired works. If so, you would be arguing to delete all Pauline books from the Bible.
If you conclude that Paul was, indeed, inspired of God, then, based upon your reasoning [need to add an object after 'spiritual'], God screwed up by not dictating to Paul what object is being described by the adjective 'spiritual'. Since this appears to be your position, you are inferring that God is a screw-up. Good luck with that!
As for me, I will conclude that Paul was inspired by God and that neither God or Paul screwed-up in 12:1 and 14:1. Surely, since in was within Paul's lexicon to combine the Greek charisma to the Greek pneumatikos when inspired by God to do so in Rom. 1:11, the omission of the Greek charisma in 12:1 and 14:1, while likewise inspired by God, is dispositive that it was not intended to be there by God. It was wholly inappropriate for any man to add an object thereafter the word 'spiritual' if not given in the manuscripts.
Accordingly, it is clear that the third option [you are in error] is the appropriate conclusion.
In both 1 Cor. 12:1 and 14:1, the intent of the manuscripts were for nouns -- not adjectives. In 12:1 the better rendering would have been 'spiritualism'. In 14:1, the better rendering would have been 'spirituality'. In no way, can one conclude that the word is an adjective amiss an object to describe.