74:18

surely he pondered and devised a plot.
Meaning:-
Ponder: think about (something) carefully, especially before making a decision or reaching a conclusion.
Devise: plan or invent by careful thought.

74:31

And We have set none but angels as guardians of the Fire, and We have fixed their number (19) only as a trial for the disbelievers, in order that the people of the Scripture (Jews and Christians) may arrive at a certainty [that this Quran is the truth as it agrees with their Books i.e. their number (19) is written in the Taurat (Torah) and the Injeel (Gospel)] and the believers may increase in Faith (as this Quran is the truth) and that no doubts may be left for the people of the Scripture and the believers, and that those in whose hearts is a disease (of hypocrisy) and the disbelievers may say: “What Allah intends by this (curious) example ?” Thus Allah leads astray whom He wills and guides whom He wills. And none can know the hosts of your Lord but He. And this (Hell) is nothing else than a (warning) reminder to mankind.
Meaning:-
Hypocrisy: a situation in which someone pretends to believe something that they do not really
Astray: into error, away from the correct path or direction

74:37

To any of you that chooses to go forward (by working righteous deeds), or to remain behind (by commiting sins),
Meaning:-
Righteous: (of a person or conduct) morally right or justifiable; virtuous, very good; excellent.

74:48

So there will not benefit them the intercession of [any] intercessors.
Meaning:-
Intercession: the action of intervening on behalf of another.
Intercessors: a person who intervenes on behalf of another, especially by prayer.

74:56

But none takes heed except by the will of Allah. He Alone is worthy to be feared and He Alone is worthy to forgive those who fear Him.
Meaning:-
Heed: pay attention to; take notice of.