1.  lemon balm(n = noun.plant) bee balm, beebalm, garden balm, melissa officinalis, sweet balm - bushy perennial Old World mint having small white or yellowish flowers and fragrant lemon-flavored leaves; a garden escapee in northern Europe and North America;
is a kind of herb, herbaceous plant
has parts: lemon balm
is a member of genus melissa, melissa

2.  lemon balm(n = noun.food) - lemony leaves used for a tisane or in soups or fruit punches;
is a kind of herb
is a part of bee balm, beebalm, garden balm, lemon balm, melissa officinalis, sweet balm

balm, balm of gilead, basil balm, bee balm, bitter lemon, field balm, garden balm, horse balm, lemon, lemon butter, lemon cheese, lemon curd, lemon drop, lemon extract, lemon geranium, lemon grass, lemon grove, lemon juice, lemon lily, lemon meringue pie, lemon mint, lemon oil, lemon peel, lemon rind, lemon shark, lemon sole, lemon sumac, lemon tree, lemon yellow, lemon zest, lip balm, molucca balm, plains lemon monarda, sea lemon, sweet balm, sweet lemon, water lemon, wild water lemon