It depends.
If it is intentional, it could be called deceit, lying, misleading, mendacity, etc etc.
Otherwise it could be a slip of the tongue (parapraxis)where a word is accidentally replaced by another. In a sexual (or otherwise nervous) setting, a slip of the tongue can be called a Freudian Slip. eg saying "I have to wash his balls" instead of "I have to wash his smalls"
It can also be innuendo, whereby ones says something which is apparently innocent but means something else, usually of a sexual nature eg What does it mean if someone says to a pretty market stallholder "Can I feel your melons?"
It can be metaphor, where a difficult idea is expressed in simple or picturesque terms eg "It's raining cats and dogs" to mean "Its raining heavily".
It can be euphemism, where the word(s) used substitute for other words or ideas that are being avoided, for reasons of sensitivity, secrecy, etc.
It can be hyperbole, (exaggeration) where the truth is stretched for emphasis eg "I've told you a million times not to do that" when you mean "I've told you many times"
It can be metonym, where a simple idea is used to represent a larger concept eg the White House to represent the US presidency. You might say "The White House is debating the war" when you mean "The Presidency is discussing the war".
It can be slang. A Londoner might say "Where's my trouble and strife" when he means "Where's my wife"
It can be a malapropism where a word is accidentally replaced by a similar sounding one eg "I can say without fear of contraception.." instead of "I can say without fear of contradiction.."
It can be a spoonerism, where the initial letters of two words are swapped eg saying "Its roaring with pain" instead of "Its pouring with rain"
For instance, John asks his friend a question, "Are you scared of Spiders?"
John's friend replies sarcastically, "Oh, yes, I'm sooooscared of them!" with various inflections indicating that he doesn't think spiders are scary at all.
When you say one thing is another, it is called a metaphor.
Superimpose means to place or lay one thing over another thing so both are still evident. It means to join or place as an addition.
it means if you help some on they will help you back ,it is the same thing as one hand washes the other.
A figure of speech in which one thing is compared to another by the use of like or as is called a simile. A simile is distinct from a metaphor which makes a comparison without using like or as.
A figure of speech involving the comparison of one thing with another thing of a different kind, (e.g., as brave as a lion).The use of such a method of comparison.
When you say one thing is another, it is called a metaphor.
To say one thing and mean another is sarcasm.
When thermal energy moves from one thing to another it is called heat energy.
A person who says one thing and does another is called 'hypocritical'.
It is called making a choice or decision.
Analogy
it is a thing that is secured or its a thing that tap by one another
A person who says one thing but does another is called a hypocrite.Saying to do this, and doing another is making someone a hypocrite
A relationship in which one organism depends on another is called a co-depending relationship.
The words 'substitute' and 'proxy' both mean using one thing to stand for another.
Juxtoposition
A sequence is the following of one thing after another