
Amaretto is a sweet Italian liqueur with a distinctive bitter-almond flavor. It originated in Saronno, where Disaronno and Lazzaroni are still made, but the style is now produced across Italy and beyond.
The marzipan note comes from benzaldehyde, and it is usually apricot kernels rather than almonds behind it — so what you are matching is a compound, not a nut. A plain syrup covers the sweetness and leaves the drink without its center.
Amaretto is a sweet almond-flavored liqueur; amaro is a bitter Italian liqueur made from herbs, roots and citrus peel. The names share the same Italian root (amaro, "bitter") but the drinks are unrelated in taste and use.
Crème de noyaux
The kernel note comes from the same compound, but this one is pink and less sweet. It colors a drink where amaretto would not. It swaps measure for measure and colors the drink, which matters in an Amaretto Sour and not at all in a Godfather.
Orgeat with a dash of brandy
Almond and sugar without the alcohol, so the brandy puts the strength back. Roughly two parts orgeat to one of brandy lands close; the drink comes out a shade nuttier and less bitter-almond.
Sugar and alcohol both preserve it, so an opened bottle keeps for years. What fades is the almond aroma on top; the sweetness and the body stay where they were.

Almond Old Fashioned
Bourbon

Amaretto Sour
Amaretto liqueur

Amaretto Sour (Jeffrey Morgenthaler recipe)
Bourbon, Amaretto liqueur

Godfather
Blended Scotch whisky

Italian Mezcal Margarita
Tequila reposado

Mai Tai
White rum

Smoked Old Fashioned Godfather
Amaretto liqueur, Bourbon, Rye whiskey, Blended Scotch whisky

Toasted Old Fashioned Godfather
Rye whiskey, Bourbon

Godfather Sour
Blended Scotch whisky, Amaretto liqueur

Alabama Slammer Shot
Amaretto liqueur, Southern / Louisiana-style whisky liqueur, Sloe gin

Mango Tequila Sour
Tequila blanco, Amaretto liqueur

Alabama Slammer
Vodka, Southern / Louisiana-style whisky liqueur

Amaretto Stone Sour
Amaretto liqueur

Bitter Dreams
Dry sparkling wine

Bubblegum Shot
Green melon liqueur, Amaretto liqueur

Caribbean Punch
White overproof rum

A.B.C. Shot
Amaretto liqueur, Irish cream liqueur, Cognac

B-54 Shot
Crème de Café liqueur, Irish cream liqueur, Amaretto liqueur

Blood Orange Cocktail
London dry gin

Tennessee Berry Mule
Tennessee whiskey, Ginger beer

57 T-Bird Shot
Vodka, Cognac orange liqueur (e.g., Grand Marnier), Amaretto liqueur

French Connection
Cognac, Amaretto liqueur

Thunderbird
Bourbon

Buona Sera Shot
Amaretto liqueur, White rum, Crème de Café liqueur