In one word, what is a person who hates the institution of marriage called?

Introduction / Context:
One word substitutions are a common feature of English vocabulary exams. This question asks for a specific term describing a person who hates marriage as an institution. The correct answer uses Greek roots that appear in several related words, so understanding these roots will help you not only with this term but also with others in the same family.

Given Data / Assumptions:

• The description is one who hates marriage.
• Option A misogamist is based on misos hate and gamos marriage.
• Option B philogynist comes from philo love and gyne woman, meaning a lover of women.
• Option C hater is a general word for someone who hates something but does not specify marriage.
• Option D synder is not a standard English term for someone who hates marriage.

Concept / Approach:
Many English words use Greek root gamos to refer to marriage. Monogamy and polygamy are common examples. The prefix miso indicates hatred, as in misogyny hatred of women. Combining miso and gamos produces misogamy, hatred of marriage, and a person with this attitude is called a misogamist. This fits the definition in the question exactly. The other options either describe different types of people or are not precise technical terms, so they cannot be correct in a formal vocabulary test.

Step-by-Step Solution:
Step 1: Identify the key idea in the stem: hatred of marriage as an institution.Step 2: Recall that miso or mis is a root meaning hate, and gamos means marriage.Step 3: Recognise that misogamist is formed from these roots and therefore means a person who hates marriage.Step 4: Check option B philogynist, which uses philo love and gyne woman, giving lover of women, not hater of marriage.Step 5: Note that hater is too general and synder is not a recognised word for this idea, which leaves misogamist as the correct answer.

Verification / Alternative check:
We can check related words to confirm. Bigamy involves marrying two people, polygamy indicates many marriages, and monogamy means being married to one person only. All of these share the root gamos. Misogamy, by contrast, is about hatred of marriage itself. From this noun, the derivative term for the person is misogamist. In contrast, misogyny is hatred of women, and a misogynist is the person with that attitude. Philogynist is the opposite of misogynist. These word families show that the pattern miso plus gamos is the one connected specifically to marriage hatred.

Why Other Options Are Wrong:
Philogynist specifically means a man who loves or is fond of women, which does not relate to the institution of marriage. Hater is vague and not a specialised one word substitution; it could refer to hatred of anything. Synder has no widely accepted meaning in this context and is likely a distractor in the options. Since the question aims for a precise technical term, only misogamist fits.

Common Pitfalls:
Some learners confuse misogamist with misogynist or with philogynist because all of them begin with mis or contain gyn. It is important to separate hatred of marriage, hatred of women, and love of women as three different concepts. Learning roots like gam for marriage and gyn for woman will help you classify these words correctly when they appear in exam questions.

Final Answer:
The one word term for a person who hates marriage is Misogamist, so option A is correct.