Massif Central (a highland in Southern France, France) / Central Highlands (a highland in Ceylon, Sri Lanka) / Guiana Highlands (a highland in Guiana Shield, Guiana, South America, mostly lying in Venezuela) / A highland in French Guiana, France, in the Guiana Shield, South America / Central Massif (a massif in Picos de Europa, Cantabrian Mountains, Northern Spain, Spain)

mask of pregnancy

funfair attraction that involves rocking figures with a rag ball that one throws / attack meant to morally or politically discredit an adversary

to build muscle

massage parlor (place where clients can pay for a massage)

(obsolete) Mâcon

(evolutionary theory, geology) mass extinction

(physics) critical mass (amount of fissile material needed to support a self-sustaining nuclear chain reaction)

Mason jar

Alternative letter-case form of pot Mason