Xenophobia is the fear of foreigners, so to solve this analogy you have to determine what zoophobia is a fear. This question is a little easier than most phobia analogy questions because the prefix zoo- is such a dead giveaway. The correct answer is that zoophobia is the fear of animals.

Arachnophobia, as you might have gathered from the prefix arach- and the suffix -phobia, is the fear of spiders; therefore, in order to solve this problem you have to determine what exactly triskaidekaphobia is the fear of. This is a tough question, but there are some clues in the word to help you determine the answer. The prefix tri­- suggests it might have something to do with the number three, and the inclusion of deka (think decathlon) suggests it might have something to do with the number ten. In the absence of any other clues it seems logical to guess the correct answer is triskaidekaphobia is fear of the number thirteen. Now, good luck trying to pronounce it.

An octogenarian is somebody in his or her eighties, so to solve this analogy you have to determine what name is given to somebody in his or her seventies. The prefix sept- is commonly used to refer to the number seven or things composed of seven parts; therefore the correct answer is “septuagenarian.” For clarification, a nonagenarian is somebody in his or her nineties, and pentagenarian is not a word.

A cartographer is someone who makes maps, so in order to solve this analogy, you have to determine which of the items is produced by a vintner. The prefix "vin-" might clue you in that the answer choice has to be wine (from the Latin for wine, vino).

Aquaphobia is the fear of water. Whenever you see the prefix ­­"aqua-," you can assume that the word will have something to do with water. So to solve this analogy, you have to determine what chronophobia is a fear of. Chronophobia has the same prefix as the word "chronological" (which has to do with the passage of time), so it would be reasonable to assume that the prefix "chrono-" implies a relationship to time. This line of thinking would lead you to the correct answer, that chronophobia is the fear of time or the passage of time.

"Ante-" and "pre-" both mean "before;" both words refer to things that come before other things. "Post" means "after" and "script" refers to writing, so a postscript is an afterword.

Anhydrous means without water ("an" = without, "hydro" = water), and analgesic means without pain ("an" = without, "algesia" = pain).

The Greek prefix hyrdo- means related to water. "Hydrodynamic" means a branch of science concerned with the movement of water and other fluids. To solve this analogy you need to consider the meaning of the Greek prefix therm- which means heat, temperature. "Thermodynamics" is therefore a branch of science concerned with heat, temperature and their relationship to movement and energy. The correct answer is therefore "heat." You might also have noticed that the root -dynam- means related to energy.

The key to solving this analogy is to know that the prefix sept- means seven and the prefix oct- means eight. So, a "septuagenarian" is someone who is in their seventies and an "octogenarian" is someone who is in their eighties.

An "aquarium" is a place where ocean-dwelling creatures are housed and displayed. So, to solve this analogy you have to determine which of these words describes an enclosure where a land-based creature (such as a snake) might be housed. It can be helpful when solving this problem to consider your Latin prefixes. "Terr-" means of or related to the Earth. So, a "terrarium" is the correct answer. Additionally, an "arboretum" is a place where trees are grown; "reptilian" means relating to the qualities of reptiles (like snakes and alligators).