One Word Substitution

Step 1: Understanding the key terms:
Trichology: Study of hair and scalp.
Saloononics: No such scientific study.
Cosmetology: Study and application of beauty treatments.
Pogonology: Study of beards.

Step 2: Conclusion: Thus, the correct answer for the study of beards is Pogonology.

Step 1: Understanding the terminology:
Lamb: A young sheep.
Ram: An adult male sheep.
He sheep: Incorrect terminology.
Ewe: An adult female sheep.

Step 2: Conclusion: Thus, the correct answer is a ram.