LOGICAL FALLACY
In philosophy, the term logical fallacy properly refers to a formal fallacy : a flaw in the structure of a deductive argument which renders the argument invalid. However, it is often used more generally in informal discourse to mean an argument which is problematic for any reason, and thus encompasses informal fallacies – valid but unsound claims or bad nondeductive argumentation – as well as formal fallacies.

SIMILIE
–noun
1. a figure of speech in which two unlike things are explicitly compared, as in “she is like a rose.”
2. an instance of such a figure of speech or a use of words exemplifying it.
Origin: 1350–1400]

IRONY
i‧ro‧ny1 /ˈaɪrəni, ˈaɪər-/ Pronunciation Key - –noun, plural -nies.

1. the use of words to convey a meaning that is the opposite of its literal meaning: the irony of her reply, “How nice!” when I said I had to work all weekend.

2. a technique of indicating, as through character or plot development, an intention or attitude opposite to that which is actually or ostensibly stated.

3. (esp. in contemporary writing) a manner of organizing a work so as to give full expression to contradictory or complementary impulses, attitudes, etc., esp. as a means of indicating detachment from a subject, theme, or emotion.