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1.
Mosquito
From Spanish 'mosquito' ("gnat"), diminutive of 'mosca' ("fly").
2.
Seaborgium
After Glenn T. Seaborg, who co-discovered it.
3.
Pilsner
After Pilsen (Germanised form of Plzeň) in Czechia, where the beer was first developed.
4.
Lesbian
After the island of Lesbos in Greece, home of Sappho, an Ancient Greek poet who frequently wrote about the beauty of (and her love for) women.
5.
Salsa
From Spanish 'salsa' ("sauce").
6.
Denim
Ultimately a contraction of the French 'serge de Nîmes' ("serge from Nîmes"), the city of Nîmes being where it was first produced.
7.
Parchment
Ultimately from Ancient Greek 'Pergamēnós' ("from Pergamon"), now Bergama in Turkey, where it was invented.
8.
Suede
From French 'Suède' ("Sweden"), from which gloves made of the fabric were exported.
9.
Cantaloupe
After Cantalupo, a former Italian Papal estate where the fruits were first grown in Europe.
10.
Monument
From Latin 'monumentum' ("memorial").
11.
Béchamel
After Louis Béchameil de Nointel, in dedication to him by his cook.
12.
Janissary
From Ottoman Turkish 'yeniçeri' ("new soldier").
13.
Banana
From Wolof 'banaana' ("banana").
14.
Gazette
Ultimately from Venetian 'gazeta' ("halfpenny"), after the cost of a newspaper.
15.
Canary
After the Canary Islands in Spain, to which they are native.
16.
Dachshund
From German 'dachs' ("badger") plus 'hund' ("dog").
17.
Meander
After Maíandros, a river in Turkey (now called the Büyük Menderes) which was well known in Antiquity for having many curves.
18.
Coach
Ultimately from Kocs in Hungary, which produced upper-class horse-drawn carts with suspension.
19.
Canola
A genericised trade name, from an acronym of Canadian Oil, Low Acid.
20.
Candidate
From Latin 'candidātus' ("one who is standing for office").