Most of these words for eating and drinking are often used. I’ve never seen “manducate” being used, but for the rest, they are all quite common. Sometimes I can encounter several just in one scene about a dinner or a party. There must be more words about eating and drinking out there, and please let me know if you encounter any.
ingest: take (food, drink, or another substance) into the body by swallowing or absorbing it.
consume: eat, drink, or ingest (food or drink).
nibble: take small bites out of.
snack: eat a snack.
Eat Quickly And In Large Quantities
swallow: cause or allow (something, especially food or drink) to pass down the throat. If used as a noun, it is also a migratory bird.
gorge: to swallow, especially greedily.
devour: eat (food or prey) hungrily or quickly.
gobble: eat (something) hurriedly and noisily
wolf: devour (food) greedily.
ingurgitate: to swallow greedily or in large quantities. This word is not used often, but the word “regurgitate” is often used to indicate to repeat (information) without analyzing or comprehending it.
chomp: munch or chew vigorously and noisily.
munch: eat (something) with a continuous and often audible action of the jaws.
masticate: chew (food).
manducate: chew or eat.
Often Used With Animals
chow: eat. This word is most often used as “dog chow”, which means dog food. As a verb, I’ve seen it used as “to eat” a couple of times.
graze: (of an animal) feed on (grass or land covered by grass).
browse: (of an animal) feed on leaves, twigs, or other high-growing vegetation.
ruminate: to chew repeatedly for an extended period
swill: drink (something) greedily or in large quantities.
gulp: swallow (drink or food) quickly or in large mouthfuls, often audibly.
drain: cause the water or other liquid in (something) to run out. I did see this word being used as “to drink” many times.
imbibe: drink (alcohol); absorb knowledge.
guzzle: eat or drink (something) greedily.
quaff: drink (something, especially an alcoholic drink) heartily.
slurp: eat or drink (something) with a loud sloppy sucking noise.
swig: drink in large gulps.
slug: drink (something, typically alcohol) in a large draft; swig.
tipple: drink alcohol, especially habitually.
sip: drink (something) by taking small mouthfuls.
bib: drink (something alcoholic).
sup: take (drink or liquid food) by sips or spoonfuls.