Grayma
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Fetus and embryo are both merely terms for developmental stages - much like infant, or toddler or juvenile. Developmental stages.
Fetus:
noun, plural fe·tus·es. Embryology . (used chiefly of viviparous mammals) the young of an animal in the womb or egg, especially in the later stages of development when the body structures are in the recognizable form of its kind, in humans after the end of the second month of gestation.
Origin:
1350–1400; Middle English < Latin fētus bringing forth of young, hence that which is born, offspring, young still in the womb, equivalent to fē- (v. base attested in L only in noun derivatives, as fēmina woman, fēcundus fecund, etc.; compare Greek thēsthai to suck, milk, Old High German tāan to suck, Old Irish denid (he) sucks) + -tus suffix of v. action
em·bry·o
[em-bree-oh] Show IPA noun, plural em·bry·os, adjective
noun 1. the young of a viviparous animal, especially of a mammal, in the early stages of development within the womb, in humans up to the end of the second month. Compare fetus.
2. Botany . the rudimentary plant usually contained in the seed.
3. any multicellular animal in a developmental stage preceding birth or hatching.
4. the beginning or rudimentary stage of anything: He charged that the party policy was socialism in embryo.
Dictionary.com
Fetus:
noun, plural fe·tus·es. Embryology . (used chiefly of viviparous mammals) the young of an animal in the womb or egg, especially in the later stages of development when the body structures are in the recognizable form of its kind, in humans after the end of the second month of gestation.
Origin:
1350–1400; Middle English < Latin fētus bringing forth of young, hence that which is born, offspring, young still in the womb, equivalent to fē- (v. base attested in L only in noun derivatives, as fēmina woman, fēcundus fecund, etc.; compare Greek thēsthai to suck, milk, Old High German tāan to suck, Old Irish denid (he) sucks) + -tus suffix of v. action
em·bry·o
[em-bree-oh] Show IPA noun, plural em·bry·os, adjective
noun 1. the young of a viviparous animal, especially of a mammal, in the early stages of development within the womb, in humans up to the end of the second month. Compare fetus.
2. Botany . the rudimentary plant usually contained in the seed.
3. any multicellular animal in a developmental stage preceding birth or hatching.
4. the beginning or rudimentary stage of anything: He charged that the party policy was socialism in embryo.
Dictionary.com